Cake Mix Peanut Butter Bars

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Published: October 19, 2015Updated: May 12, 2021Author: Kristen Hills
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Cake Mix Peanut Butter Bars

Cake mix and peanut butter bars are the perfect combination! And it is so easy to make! But beware….. once you start eating these there is no stopping! I almost ate half the pan by myself!

Serves: 24

Cake Mix Peanut Butter Bars Recipe

Cake mix and peanut butter bars are the perfect combination! And it is so easy to make!
Prep Time 10 mins
Cook Time 25 mins
Total Time 35 mins
Print

Ingredients

  • 1 cup peanut butter
  • ½ cup water
  • 1 large egg
  • 15.25 ounces yellow cake mix

Frosting

  • ½ cup margarine softened, 1 stick
  • ¼ cup milk
  • 2 teaspoons vanilla (1-2 depending on your taste)
  • 3 Tablespoons cocoa powder
  • 3 cups powdered sugar

Instructions

  • Heat the oven to 350°F.
  • Spray a 13 X 9-inch pan with no-stick cooking spray.
  • In a medium bowl combine 1 cup of peanut butter, water and egg in large bowl, stirring until smooth. Stir in cake mix until blended well. Spread into prepared pan.
  • BAKE 20 to 25 minutes or until puffed and light golden brown. Cool completely.
  • Mix all ingredients with a hand mixer until smooth. Add more powdered sugar or milk until you reach desired consistency and spread on top of bars.

Nutrition

Calories: 201 kcal · Carbohydrates: 23 g · Protein: 5 g · Fat: 11 g · Saturated Fat: 2 g · Trans Fat: 1 g · Cholesterol: 20 mg · Sodium: 189 mg · Potassium: 124 mg · Fiber: 1 g · Sugar: 16 g · Vitamin A: 228 IU · Vitamin C: 1 mg · Calcium: 50 mg · Iron: 1 mg

Equipment

  • 9x13-inch Baking Pan
  • Medium Mixing Bowl
  • Hand mixer
  • Small Mixing Bowl

Recipe Details

Course: Dessert
Cuisine: American

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  1. Cristina @ I Say Nomato says:
    October 19, 2015
    These look amazing! I love peanut butter chocolate anything, so this is right up my alley. Love how you use cake mix- makes it so easy!
    Reply
  2. Happy Valley Chow says:
    October 19, 2015
    Peanut butter and chocolate is my weakness, great recipe!
    Reply
  3. Ashley says:
    October 20, 2015
    This looks amazing! Can butter be used instead of margarine?
    Reply
    • Cyd says:
      October 20, 2015
      Hi Ashley, you can definitely use butter in this recipe. :)
      Reply
      • Ashley says:
        October 25, 2015
        Thanks, Cyd! I ended up making these bars this weekend to help celebrate our anniversary, and they turned out so delicious! The chocolate frosting is super rich, but the peanut butter cake bars aren't, so they even each other out! We love peanut butter and chocolate around here, so I'll make these again.
        Reply
  4. Linda says:
    November 1, 2015
    Baked these yesterday and they are great. Will bake again. Very good.
    Reply
  5. Alexis says:
    May 15, 2018
    Do you mix the cake mix before you stir into peanut butter mixture
    Reply
    • Cyd says:
      May 16, 2018
      Do not make the cake. Just add the dry cake mix into the other ingredients.
      Reply
  6. Jill says:
    August 10, 2018
    Can you canned frosting for the topping
    Reply
    • Cyd says:
      August 13, 2018
      If you like canned frosting, then definitely add that for the frosting top. That is not a problem at all for this recipe.
      Reply
  7. Hiam Garner says:
    November 6, 2018
    Do you need to refrigerate this since the frosting has milk?
    Reply
    • Cyd says:
      November 16, 2018
      Refrigerate any leftovers. They should be fine being left out a few hours. But not for a long extended length of time.
      Reply
  8. Jane says:
    May 26, 2019
    Gonna have to try these that’s for sure...
    Reply
  9. Jane says:
    May 26, 2019
    Gonna have to try this that’s for sure.
    Reply
  10. Chris says:
    February 20, 2020
    I use store bought chocolate frosting, melt it a little in the microwave add peanut butter (your call how much) After mixed well and melty I pour it over the warm bars Big hit
    Reply
    • Cyd says:
      February 22, 2020
      Hi Christ. That sounds amazing! Thanks for sharing.
      Reply
  11. Allie says:
    September 20, 2020
    Can you use milk instead of water?
    Reply
    • Cyd says:
      September 22, 2020
      I'm sure milk will work great too.
      Reply
  12. Ludi Martin says:
    November 18, 2020
    Can you illiminate the frosting?
    Reply
    • Momma Cyd says:
      November 26, 2020
      Yes, you could totally leave the frosting off if you wanted.
      Reply
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