These No Bake Peanut Butter Cornflake Cookies with Marshmallows are the ultimate sweet treat for any occasion. Whether you’re satisfying a late-night craving or preparing for a festive gathering, these easy-to-make cookies deliver on flavor and fun! With their delightful crunch from cornflakes and gooey marshmallow goodness, they are sure to be a hit at holidays like Christmas, Thanksgiving, and Easter. Plus, there’s no baking required—just simple mixing and chilling!

Why You’ll Love This Recipe
- Quick to Prepare: You can whip these cookies together in just 20 minutes, making them perfect for last-minute cravings or unexpected guests.
- Kid-Friendly Fun: Involve the kids in the kitchen! They’ll love helping to mix ingredients and shape the cookies.
- Customizable Delight: Feel free to add or substitute your favorite mix-ins, such as chocolate chips or nuts, for a personal touch.
- No-Bake Convenience: With no oven needed, you can enjoy these treats even in hot weather without heating up your kitchen.
- Perfect for Sharing: These cookies make great gifts or party favors. Just package them nicely for a sweet surprise!
Tools and Preparation
To create these delicious cookies, you’ll need a few essential tools that will make the process smooth and enjoyable.
Essential Tools and Equipment
- Large pot
- Measuring cups
- Wooden spoon or spatula
- Cookie scooper
- Parchment paper
- Microwave-safe bowl
- Ziplock bag
Importance of Each Tool
- Large pot: This is crucial for melting the butter and peanut butter together without burning them.
- Cookie scooper: Ensures uniform cookie sizes for even setting and easy serving.
- Parchment paper: Prevents sticking and makes cleanup a breeze.
Ingredients
For the Cookie Mixture
- 4 tablespoon butter (salted)
- ¾ cup peanut butter (smooth)
- 10 oz mini marshmallows
- 7 cups cornflakes
For Mixing In
- 1 oz mini marshmallows
- ⅓ cup peanut butter chips (optional)
For Drizzling
- 2 tablespoon peanut butter chips
- ½ teaspoon vegetable or canola oil

How to Make No bake peanut butter Cornflake cookies with marshmallows
Step 1: Melt the Butter and Peanut Butter
In a large pot over medium-low heat, melt the 4 tablespoons of butter along with ¾ cup of peanut butter. Stir continuously until completely melted.
Step 2: Add Marshmallows
Add in the 10 oz of mini marshmallows, stirring constantly until fully melted. Once melted, remove from heat.
Step 3: Combine with Cornflakes
Gently stir in the 7 cups of cornflakes, ensuring they are fully coated. Fold in an additional 1 oz of mini marshmallows, along with any optional peanut butter chips, taking care not to overmix.
Step 4: Form Cookies
Spray a large cookie scooper with nonstick cooking spray. Scoop out 10 equally sized balls onto a parchment-lined baking sheet. Lightly grease your fingers and spread each cookie to about 1 inch thick without packing them too tightly.
Step 5: Drizzle Peanut Butter
Melt the remaining 2 tablespoons of peanut butter chips, combined with ½ teaspoon oil, in the microwave (30 seconds at a time). Pour this mixture into a ziplock bag, cut a small opening at the top, and drizzle over each cookie.
Step 6: Let Set
Allow the cookies to set for about 20-30 minutes before serving. Enjoy your delicious no-bake treats!
How to Serve No bake peanut butter Cornflake cookies with marshmallows
These no-bake peanut butter cornflake cookies with marshmallows are delightful and versatile treats that can be enjoyed in various ways. Here are some serving suggestions to enhance your experience.
As a Dessert Platter
- Create a dessert platter by arranging these cookies alongside other sweets, like brownies or fruit tarts, for a colorful treat tray.
With a Glass of Milk
- Pair these cookies with a cold glass of milk for a classic combination that enhances their sweet and crunchy texture.
Crumbled Over Ice Cream
- Crumble the cookies over vanilla or chocolate ice cream for an extra crunch and delicious flavor contrast.
Wrapped as Gifts
- Package the cookies in decorative bags or boxes to give as gifts during holidays or special occasions.
At Parties
- Serve these no-bake treats at parties or gatherings as easy-to-eat finger foods that everyone will love.
As Lunchbox Treats
- Include these cookies in kids’ lunchboxes for a fun and sweet surprise that’s sure to brighten their day.
How to Perfect No bake peanut butter Cornflake cookies with marshmallows
To ensure your no-bake peanut butter cornflake cookies turn out perfectly every time, consider these helpful tips.
- Use fresh ingredients: Make sure your peanut butter, marshmallows, and cornflakes are fresh for the best texture and taste.
- Melt slowly: Melt the butter and peanut butter over low heat to avoid burning. This ensures a creamy mixture that coats the cornflakes well.
- Don’t overmix: Once you add the cornflakes and mini marshmallows, mix gently to keep the cookies light and airy.
- Chill before serving: Allow the cookies to set at room temperature or refrigerate them briefly for a firmer texture before serving.
- Adjust sweetness: If you prefer less sweetness, reduce the amount of mini marshmallows or omit the optional peanut butter chips.
- Experiment with toppings: Try adding drizzles of chocolate or sprinkle crushed nuts on top for added flavor and texture.

Best Side Dishes for No bake peanut butter Cornflake cookies with marshmallows
These no-bake peanut butter cornflake cookies pair wonderfully with several side dishes. Here are some options to consider.
- Fresh Fruit Salad: A mix of seasonal fruits can balance the sweetness of the cookies with refreshing flavors.
- Yogurt Parfait: Layer yogurt with granola and berries for a nutritious side that complements the cookie’s sweetness.
- Chocolate Fondue: Set up a fondue station where guests can dip fruits or pretzels, making it interactive and fun.
- Cheese Platter: A selection of cheeses can provide a savory contrast to the sweet flavors of your cookies.
- Nut Mix: A mix of roasted nuts adds crunchiness and pairs well with the soft textures of your treats.
- Smoothie Bowl: Serve smoothie bowls topped with granola for a healthy alternative that still feels indulgent next to your cookies.
Common Mistakes to Avoid
When making no bake peanut butter Cornflake cookies with marshmallows, it’s easy to run into some common pitfalls. Here are mistakes to watch out for.
- Overheating the mixture – If the peanut butter and marshmallow mixture is cooked too long, it can harden. Always melt on low heat and stir frequently.
- Not measuring ingredients accurately – Incorrect measurements can affect texture and taste. Use measuring cups for precision.
- Using stale cornflakes – Fresh cornflakes provide the best crunch. Check the expiration date before use.
- Skipping the cooling time – Allowing cookies to set properly ensures they hold their shape and texture. Be patient and don’t rush this step.
- Packing cookies too tightly – When forming cookies, leave them fluffy rather than dense. This keeps them chewy and enjoyable.
Refrigerator Storage
- Store in an airtight container.
- They will stay fresh for up to 2 days in the refrigerator.
Freezing No bake peanut butter Cornflake cookies with marshmallows
- Place cookies in a single layer on a baking sheet.
- Freeze until solid, then transfer to an airtight container or ziplock bag.
- They can be frozen for up to 3 months.
Reheating No bake peanut butter Cornflake cookies with marshmallows
- Oven – Preheat to 350°F (175°C) and warm for about 5-10 minutes.
- Microwave – Heat for 5 seconds for a gooey texture.
- Stovetop – Use a non-stick pan on low heat for about 1-2 minutes, flipping occasionally.

Frequently Asked Questions
How do I make no bake peanut butter Cornflake cookies with marshmallows?
To make these delicious cookies, melt peanut butter, butter, and mini marshmallows together. Mix in cornflakes and additional mini marshmallows before forming into balls.
Why are my no bake peanut butter Cornflake cookies not gooey?
If they aren’t gooey, you may have overheated the mixture or stored them in a cold environment. Try reheating them slightly in the microwave.
How long do no bake peanut butter Cornflake cookies last?
These cookies can last up to 2 days in an airtight container at room temperature. For longer storage, consider freezing them.
Can I customize my no bake peanut butter Cornflake cookies?
Absolutely! You can add chocolate chips or nuts for extra flavor and crunch. Get creative with your favorite mix-ins!
Final Thoughts
These no bake peanut butter Cornflake cookies with marshmallows are perfect for any occasion. Their sweet, chewy texture makes them a delightful treat that’s easy to prepare. Feel free to customize them with your favorite add-ins!

No Bake Peanut Butter Cornflake Cookies with Marshmallows
- Total Time: 55 minute
- Yield: Approximately 12 cookies 1x
Description
No Bake Peanut Butter Cornflake Cookies with Marshmallows are the perfect sweet treat for any occasion, combining a delightful crunch with gooey marshmallow goodness. These quick and easy no-bake cookies can be whipped up in just 20 minutes, making them ideal for satisfying late-night cravings or preparing for festive gatherings. With their delightful mix of textures and flavors, these cookies are sure to impress at holiday celebrations like Christmas, Thanksgiving, or Easter. Plus, they’re customizable—add your favorite mix-ins like chocolate chips or nuts! Simply mix the ingredients, chill, and enjoy these delectable treats without ever turning on the oven.
Ingredients
- 4 tablespoons salted butter
- ¾ cup smooth peanut butter
- 10 oz mini marshmallows
- 7 cups cornflakes
Instructions
- In a large pot over medium-low heat, melt the butter and peanut butter together until smooth.
- Stir in the mini marshmallows until fully melted; remove from heat.
- Gently fold in the cornflakes and additional mini marshmallows (and optional peanut butter chips).
- Scoop out cookie-sized portions onto parchment paper using a greased cookie scooper.
- Drizzle melted peanut butter chips mixed with oil over each cookie.
- Allow cookies to set for about 20-30 minutes before serving.
- Prep Time: 20 minutes
- Cook Time: None
- Category: Dessert
- Method: No-Bake
- Cuisine: American
Nutrition
- Serving Size: 1 serving
- Calories: 130
- Sugar: 9g
- Sodium: 70mg
- Fat: 6g
- Saturated Fat: 2g
- Unsaturated Fat: 4g
- Trans Fat: 0g
- Carbohydrates: 19g
- Fiber: 1g
- Protein: 2g
- Cholesterol: 5mg
Keywords: For extra texture, consider adding crushed nuts or drizzling chocolate on top. Store cookies in an airtight container for up to two days or freeze for longer storage.
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