Sweet & Salty No-Bake Peanut Butter Marshmallow Cornflake Treats

Craving a delightful sweet treat that requires absolutely no baking? Look no further than these irresistible No-Bake Marshmallow Peanut Butter Cornflake Cookies! Inspired by the popular Crumbl Cookie sensation, this easy, low-effort recipe brings together the classic flavors of peanut butter and marshmallow with the satisfying crunch of cornflakes. Perfect for a quick weeknight dessert or an impressive addition to holiday spreads for Christmas, Thanksgiving, or Easter, these cookies are a guaranteed crowd-pleaser.

Tune in as we dive deep into this simple yet sensational no-bake cornflake cookie recipe. For the full, detailed ingredient list and step-by-step instructions, make sure to scroll down to the dedicated recipe card.

If you’re a fan of fuss-free desserts and crave-worthy sweet treats, you absolutely must add these to your repertoire. For more no-bake inspiration, be sure to explore other delightful recipes like Crumbl Chocolate Crunch Cookies (Star Crunch Copycat), these incredibly simple No-Bake 3-Ingredient Peanut Butter Cookies, a luxurious No-Bake Chocolate Pie with Oreo Crust, and the ever-popular Peanut Butter Rice Krispy Treats with Marshmallows. Each of these recipes delivers exceptional flavor without ever needing to turn on your oven, making them ideal for satisfying those spontaneous sweet cravings.

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Peanut butter cornflake cookies

I confess, I have a deep obsession with Cornflakes. By extension, I’m absolutely captivated by these no-bake peanut butter cornflake cookies. They strike the perfect balance, offering just the right amount of delightful crunch without being overly hard or difficult to chew. The textural contrast between the creamy peanut butter and the crispy cereal is simply divine, creating a satisfying experience with every bite.

What truly elevates these cookies is their subtle hint of saltiness, which, if we’re being completely honest, makes them incredibly addictive. For someone like me, who appreciates a touch of salt with their sweets, Cornflakes have always been a favorite cereal. They offer a unique flavor profile that feels like a clever combination of crackers and cereal, perfectly seasoned with that tantalizing saltiness. This very characteristic is what makes these no-bake cookies so utterly irresistible.

The Ultimate No-Bake Peanut Butter Cornflake Cookie Recipe!

Today, we’re recreating a beloved holiday classic: the no-bake peanut butter cornflake candies or cookies. These treats bear a striking resemblance to traditional rice crispy treats, but with a delicious twist. Instead of using puffed rice cereal, we harness the unparalleled crunch and flavor of Cornflakes. This simple substitution transforms a familiar favorite into something truly special and distinctly delightful.

The true secret to achieving their signature extra-chewy texture lies in a special addition at the very end: a handful of mini marshmallows. These aren’t just for decoration; they melt subtly into the mixture, creating pockets of gooey goodness that elevate these no-bake cookies into a truly unforgettable culinary experience. Trust me, this small detail makes all the difference, ensuring each cookie is perfectly chewy and utterly satisfying!

No bake cornflake cookie stack

Why You Absolutely Need to Make These Cookies!

These no-bake marshmallow peanut butter cornflake cookies offer a multitude of reasons to become your next go-to dessert:

  • No Baking Required: The biggest advantage! Skip the oven and the stress of baking, making these perfect for hot days or when you just want a quick, easy dessert.
  • Minimal Ingredients: You only need a handful of common pantry staples to whip up a batch of these delectable cookies. Simple ingredients, extraordinary results!
  • Impressively Simple: Despite their stunning appearance and delightful taste, these cookies are incredibly easy to make. They look like you spent hours in the kitchen, but they come together in minutes.
  • Perfect for Any Occasion: Whether you’re entertaining a crowd, celebrating birthdays, hosting a casual get-together, or marking big holidays, these cookies are always a hit. Their universal appeal makes them suitable for any event.
  • Crumbl Copycat Perfection: Enjoy your favorite Crumbl-inspired cookie experience without the hefty price tag or the wait for a specific flavor to return to stores. Recreate the magic right in your own kitchen, anytime you crave it.
  • Kid-Friendly & Fun: Involve the little ones in the kitchen! Their simple preparation makes them a fun project for kids, who will love helping mix and shape these tasty treats.
  • Customizable: Easily adapt this recipe to your liking. Add chocolate chips, sprinkles, or a different drizzle to personalize your batch.
Crumbl cornflake marshmallow cookies ingredients

Essential Ingredients for These Peanut Butter Cornflake Cookies

Gathering the right ingredients is the first step to creating these delightful no-bake cornflake Krispy treat cookies. Here’s a breakdown of what you’ll need, along with some helpful tips:

  • Butter: For the best flavor balance, opt for salted butter. The salt helps to cut through the sweetness and enhances the peanut butter notes, creating that irresistible sweet and salty combination we all love.
  • Peanut Butter: Smooth peanut butter is crucial for achieving a consistent, creamy base. It melts beautifully and integrates seamlessly with the other ingredients. It’s important to use regular, shelf-stable peanut butter rather than natural, oil-separated varieties. Natural peanut butter often has a different fat content and can prevent the cookies from setting properly, leading to a greasy or crumbly texture.
  • Mini Marshmallows: These are the heart of the chewy texture. While larger marshmallows can be used, mini marshmallows melt more evenly and quickly, ensuring a perfectly smooth and gooey binder for your cornflakes. You’ll use most of them in the initial melting stage and a smaller portion to fold in at the very end for extra chewiness.
  • Peanut Butter Chips (Optional for Drizzle): These add an extra layer of peanut butter flavor and a professional, visually appealing finish. Melted and drizzled over the set cookies, they transform them into a true bakery-worthy treat. If you’re not a fan of peanut butter chips or want to simplify, you can omit them or use melted chocolate chips instead.
  • Oil (for Drizzle): A small amount of neutral oil, such as vegetable or canola oil, is used to thin out the melted peanut butter chips. This ensures a smooth, easy-to-drizzle consistency that sets nicely without cracking.
  • Cornflakes Cereal: The undisputed star of this recipe! Cornflakes provide that incredible, satisfying crunch that sets these cookies apart. Make sure to use regular, plain cornflakes cereal. Frosted cornflakes contain extra sugar and can make the cookies overly sweet, potentially altering the texture as well.
Overhead Crumbl No bake marshmallow peanut butter cornflake cookies

How to Create Crumbl-Style Cornflakes Marshmallow Cookies from Scratch

Making these delightful Crumbl-inspired cornflakes marshmallow cookies is incredibly straightforward. Follow these steps for a perfect batch every time:

  1. Melt the Base: In a large, heavy-bottomed pot, combine the butter and the main portion of mini marshmallows (10 oz). Melt them together over medium-low heat, stirring continuously. Constant stirring is key to prevent scorching and ensure a smooth, uniform mixture. Once completely melted and smooth, remove the pot from the heat immediately.
  2. Combine with Cornflakes: Add the 7 cups of cornflakes cereal to the marshmallow-peanut butter mixture. Using a sturdy spoon or spatula, gently stir until all the cornflakes are thoroughly coated. Be careful not to crush the cereal too much, as we want to preserve their crunch.
  3. Fold in Extra Marshmallows: Now, add the remaining 1 oz of mini marshmallows and the optional peanut butter chips to the mixture. Gently fold them in just until combined. Avoid overmixing here; the goal is to have pockets of slightly melted marshmallows and peanut butter chips that add to the chewiness and flavor.
  4. Shape the Cookies: Lightly spray a large cookie scooper with nonstick cooking spray. Scoop out about 10 equally sized portions of the mixture onto a parchment-lined baking sheet. Grease your fingers (a little butter or cooking spray works well) and gently spread each cookie ball to about 1 inch in thickness, forming a classic cookie shape. Don’t press them too firmly; a looser pack helps maintain a delightful chewiness rather than a dense, hard cookie.
  5. Prepare the Drizzle: In a microwave-safe bowl, combine the peanut butter chips designated for drizzling (2 tbsp) and the vegetable or canola oil (1/2 tsp). Microwave in 30-second intervals, stirring well after each interval, until the mixture is smooth and easily pourable. Transfer the melted peanut butter drizzle to a small ziplock bag and snip a tiny corner off the bag to create a piping tool.
  6. Drizzle and Set: Artfully drizzle the peanut butter mixture over each cookie. Once drizzled, allow the cookies to set at room temperature for approximately 20-30 minutes, or until firm enough to handle and enjoy. The setting time can vary based on your kitchen’s temperature.
  7. Enjoy Your Creation: Once set, these delectable No-Bake Marshmallow Peanut Butter Cornflake Cookies are ready to be savored!
Cornflakes marshmallow peanut butter mixture
Cornflakes marshmallow peanut butter cookies
Cornflakes marshmallow peanut butter cookies
No bake cornflakes cookies

Frequently Asked Questions (FAQ)

Why are my no-bake cornflakes marshmallow cookies not gooey?

There are a couple of common reasons why your cookies might not be as wonderfully gooey as desired:

  • Overcooking the Mixture: If the peanut butter and marshmallow mixture is cooked for too long or at too high a heat, it can caramelize and harden significantly as it cools. To prevent this, make sure to melt the ingredients over low to medium-low heat, stirring constantly, and remove from heat as soon as it’s fully melted and smooth.
  • Temperature of Your Environment: Sometimes, the ambient temperature of your kitchen can affect the gooeyness. If it’s particularly cold, the cookies might firm up more quickly than expected. The simple solution? Pop them in the microwave for just 5-10 seconds before enjoying. This quick burst of heat will bring back their irresistible ooey-gooey texture.

How long will my no-bake cookies stay fresh for?

These delicious cornflake cookies will maintain their best quality for up to 2 days when stored in an airtight container at room temperature. To ensure maximum enjoyment, I highly recommend warming them in the microwave for a mere 5 seconds just before serving. This brief warm-up will revive their delightful ooey-gooey texture, making them taste as fresh and delectable as when they were first made.

How long does it take for these peanut butter cornflake cookies to set?

The setting time for these cookies can vary based on the temperature of your kitchen. Generally, they will take anywhere from 20 to 35 minutes to fully set. The main goal is to allow them to cool down and firm up to room temperature after being hot from the pot. If your kitchen is cooler, they might set faster; in a warmer environment, they might take a little longer. You’ll know they’re ready when they are firm enough to pick up without falling apart.

Hand holding cornflakes marshmallow cookies

Can I refrigerate these no-bake cornflakes cookies?

It is generally preferable to store these cookies at room temperature to preserve their soft and chewy texture. When refrigerated, the cookies tend to become quite firm, which can detract from their enjoyable consistency. If you do find them too hard after refrigeration, a quick 5-second zap in the microwave can help soften them back up.

Can I freeze my Crumbl peanut butter cornflakes marshmallow cookies?

Unfortunately, these cookies do not freeze well. Freezing them can significantly alter their delicate texture, making them less appealing upon thawing. For the best experience, these no-bake cookies are best enjoyed within a day or two of making them, when their fresh, chewy, and crispy qualities are at their peak.

Crumbl No bake marshmallow peanut butter cornflake cookies

Crumbl-Inspired No-Bake Marshmallow Peanut Butter Cornflake Cookies Recipe

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Crumbl cornflakes marshmallow cookies

No-Bake Peanut Butter Cornflake Cookies with Marshmallows

These Crumbl-inspired No-Bake Marshmallow Peanut Butter Cornflake Cookies are incredibly easy, low-effort, and perfect for satisfying those sweet cravings, whether it’s a weeknight treat or for festive holidays like Christmas, Thanksgiving, and Easter!
Prep Time: 15 minutes
Cook Time: 5 minutes
Total Time: 20 minutes
Servings: 10 cookies
Print Recipe

Ingredients

  • 4 tbsp salted butter
  • 3/4 cup smooth peanut butter
  • 10 oz mini marshmallows
  • 1/3 cup peanut butter chips (optional, for mixing in)
  • 7 cups cornflakes cereal
  • 1 oz mini marshmallows (for mixing in at the end for extra chewiness)
  • 2 tbsp peanut butter chips (for drizzling)
  • 1/2 tsp vegetable or canola oil (for thinning drizzle)

Instructions

  1. In a large pot, melt the 4 tbsp of salted butter and 3/4 cup of smooth peanut butter over medium-low heat. Add 10 oz of mini marshmallows and stir constantly until the mixture is fully melted and smooth. Immediately remove the pot from the heat to prevent overcooking.
  2. Stir in the 7 cups of cornflakes cereal until they are completely coated with the peanut butter and marshmallow mixture. Gently fold in the remaining 1 oz of mini marshmallows and the optional 1/3 cup of peanut butter chips until just combined. Be careful not to overmix, as this helps maintain the integrity of the cornflakes.
  3. Prepare a baking sheet by lining it with parchment paper. Spray a large cookie scooper with nonstick cooking spray, then scoop out 10 equally sized portions of the mixture onto the prepared baking sheet. Lightly grease your fingers and gently spread each portion to form a cookie shape, approximately 1 inch in thickness. Avoid packing them too densely to ensure a delightfully chewy, rather than hard, cookie.
  4. For the drizzle, combine 2 tbsp of peanut butter chips and 1/2 tsp of vegetable or canola oil in a microwave-safe bowl. Microwave in 30-second intervals, stirring thoroughly after each, until the mixture is smooth and runny. Transfer the melted drizzle to a small ziplock bag and snip a tiny corner off. Drizzle artistically over each shaped cookie.
  5. Allow the cookies to set at room temperature for 20-30 minutes before serving. The setting time may vary depending on the ambient temperature of your kitchen.

Notes

Why are my no-bake cornflakes marshmallow cookies not gooey?

This can depend on a few things. If you overcook the peanut butter marshmallow mixture, it will almost caramelize and harden as it cools down, so make sure to melt it low and slow. Another issue could be that it’s just too cold where you’re at; the solution to this would be to pop them in the microwave for 5 seconds and enjoy them.

How long will my no-bake cookies stay fresh for?

These cornflakes cookies will last for up to 2 days in an airtight container at room temperature. I strongly suggest popping them in the microwave for 5 seconds before enjoying them; they will become ooey-gooey again and so, so good!

Can I refrigerate or freeze these no-bake cornflakes cookies?

It’s preferable to keep these cookies at room temperature to keep them soft. Once they go into the fridge, they will become too hard to enjoy. These cookies also don’t freeze well, as freezing them will negatively affect their texture. They are best consumed fresh within a couple of days.

Nutrition Information (Approximate per Serving)

Calories: 361 Carbohydrates: 49g Protein: 8g Fat: 17g Saturated Fat: 7g Polyunsaturated Fat: 3g Monounsaturated Fat: 6g Trans Fat: 1g Cholesterol: 13mg Sodium: 310mg Potassium: 161mg Fiber: 2g Sugar: 24g Vitamin A: 490IU Vitamin C: 4mg Calcium: 12mg Iron: 6mg

Nutrition information is automatically calculated and should only be used as an approximation.

Thank you for exploring this delicious recipe!

If you made and enjoyed these No-Bake Marshmallow Peanut Butter Cornflake Cookies, don’t forget to let us know in the comments below! We love hearing from you. In the meantime, be sure to follow us on Instagram for more sweet inspiration and behind-the-scenes fun!

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Shop Ingredients for This Recipe

This post may contain affiliate links. As an Amazon Associate, I earn from qualifying purchases, at no cost to you.

Find essential ingredients like mini marshmallows, your favorite smooth peanut butter, and cornflakes cereal at your local grocery store or online retailer. For kitchen tools, consider investing in a good quality cookie scoop and parchment paper for easy preparation.

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Crumbl cornflakes marshmallow cookies
Crumbl cornflakes marshmallow cookies
Crumbl cornflakes peanut butter marshmallow cookies