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Crumbl cornflakes marshmallow cookies
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5 from 30 votes

No bake peanut butter Cornflake cookies with marshmallows

These Crumbl No-bake marshmallow peanut butter cornflake cookies are easy, low-effort, no-bake sweet treats that you can make for those weeknight sweet cravings or for big holidays like Christmas, Thanksgiving, and Easter!
Prep Time15 mins
Cook Time5 mins
Total Time20 mins
Course: Dessert
Cuisine: American
Servings: 10 cookies
Calories: 361Calories


  • 4 tablespoon butter salted
  • ¾ cup peanut butter smooth
  • 10 oz mini marshmallows
  • cup peanut butter chips optional
  • 7 cups cornflakes
  • 1 oz mini marshmallows To mix in at the end
  • 2 tablespoon peanut butter chips for drizzling
  • ½ teaspoon vegetable or canola oil


  • In a large pot over medium-low heat melt the butter, and the peanut butter. Add in the 10 oz of the mini marshmallows, stirring constantly until fully melted. Remove from heat.
  • Stir in the cornflakes until fully coated. Mix in the rest of the mini marshmallows (1oz) and the optional peanut butter chips and gently fold to combine. Don't overmix.
  • Spray a large cookie scooper with nonstick cooking spray and scoop out 10 equally sized peanut butter cornflakes balls onto a parchment-lined baking sheet. Grease your fingers and gently spread the cookies to about 1 inch in thickness. Don't pack them so they aren't too dense.
  • Melt the peanut butter chips and oil in the microwave in 30-second increments mixing in between every time. Pour the mixture n a ziplock bag and cut a small opening in the top of the bag and top each cookie with some peanut butter drizzle.
  • Let set for 20-30 minutes before serving.


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.

The next 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 air-tight 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!



Calories: 361Calories | 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