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Easy cornflake bars with butterscotch chips, chocolate chips, and marshmallows.

Peanut butter Cornflake bars

Cornflake bars are a peanut butter cornflake topping layered between marshmallows, chocolate and another layer of cornflakes.
3 from 1 vote
Prep Time 20 mins
Cook Time 25 mins
Total Time 45 mins
Course Dessert
Cuisine American
Servings 12 bars
Calories 596 kcal


  • Electric mixer
  • Baking sheets
  • Measuring cups and spoons
  • Mixing bowls
  • spatula
  • 9x13 cake pan


Cornflake crunch topping

  • 4 cups cornflakes
  • cup powdered milk
  • 3 tablespoon granulated sugar
  • 1 teaspoon salt
  • ½ cup unsalted butter melted
  • cup creamy peanut butter melted

For the bars

  • 1 cup unsalted butter room temperature
  • 1⅓ cups granulated sugar
  • ½ cup brown sugar
  • 1 teaspoon vanilla extract
  • 1 large egg
  • 1⅔ cup all-purpose flour
  • ¾ cup bread flour
  • ½ teaspoon baking soda
  • ½ teaspoon baking powder
  • teaspoon salt
  • 2 cups marshmallows mini
  • ½ cup semi-sweet chocolate chips
  • ½ cup butterscotch chips


Cornflake crunch topping

  • Preheat oven to 275°. Line a baking sheet with either parchment paper or a silicon mat. But cornflakes in a bag and crush with a rolling pin. Melt butter and peanut butter in a microwavable bowl.
  • In a medium sized mixing bowl, mix together the crushed cornflakes, granulated sugar, powdered milk, and salt.
  • Pour in melted butter over cornflake mixture and toss to combine. It is okay if the cornflakes form littler clusters.
  • Pour mixture onto prepared baking sheet and bake for 20 minutes or until the mixture is slightly toasted.
  • Cool completely and break up any larger clusters into little bits.

For the bars

  • Preheat oven to 350°. Spray a 9x13 baking pan with non stick spray and set aside.
  • In a large mixing bowl, with an electric mixer on medium speed cream butter and both sugars until smooth. Add large egg and vanilla extract. Mix for an additional 8-9 minutes to allow air into the dough.
  • Add in both flours, baking soda and powder, and salt and mix on low just until it is combined. Fold in cornflake crunch.
  • Divide the dough in half and place half of it on the bottom of the greased pan. Press down into an even layer. Top it with semi-sweet, butterscotch chips, and marshmallows.
  • Cover the rest with the rest of the dough in an even layer on top and extend all the way to the edges. Bake for 25-30 minutes or until golden brown. Cool before cutting and serving!


Serving: 12barsCalories: 596kcalCarbohydrates: 83gProtein: 6gFat: 28gSaturated Fat: 17gPolyunsaturated Fat: 1gMonounsaturated Fat: 7gTrans Fat: 1gCholesterol: 81mgSodium: 680mgPotassium: 159mgFiber: 2gSugar: 52gVitamin A: 942IUVitamin C: 2mgCalcium: 69mgIron: 4mg
Keyword Cornflakes, layered dessert bars
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