Cake Mix Peanut Butter Bars Recipe

I love when I find good cake mix recipes because I know I will usually have all of the ingredients on hand! These Peanut Butter Cake Mix Bars were perfect for someone like me who can’t quite seem to get enough peanut butter into my diet, but don’t like to spend a ton of time in the kitchen! So easy, and so delicious, you’ll be making them for every occasion!

related recipe: if you love these cake mix peanut butter bars, you’ll love our No Bake eclair cake.

Serves: 20

Cake Mix Peanut Butter Bars Recipe

1 hrPrep Time

25 minCook Time

1 hr, 25 Total Time

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  • 1 white cake mix
  • 1 egg
  • 3/4 cup peanut butter
  • 1/4 cup canola oil
  • Filling
  • 1 (14 oz) can sweetened condensed milk
  • 1/2 cup peanut butter chips
  • 3/4 cup chopped peanuts
  • 1 cup chopped Reese's (I used the Reese's Minis and cut them into thirds!)


  1. Preheat oven to 350 degrees.
  2. Mix cake mix, egg, peanut butter and canola oil in a large bowl. Mix with large spoon (or hands) until it makes a crumbly dough. Press 3/4 dough into the bottom of a greased 9 x 13 inch pan.
  3. Set the 1/4 dough mixture aside.
  4. Pour entire can of sweetened condensed milk over the pressed dough. Then sprinkle peanuts, peanut butter chips, and Reese's on top. The remaining dough should be a little crumbly, sprinkle what's left over the condensed milk and toppings. Most of the middle layer should be covered.
  5. Place in the oven and cook for 20-25 minutes, or until edges are golden brown.
  6. Cool for at least 45 minutes before serving, or dig in with a spoon right out of the oven for a gooey warm peanut butter treat! 😉

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18 Responses to “Cake Mix Peanut Butter Bars Recipe”

    • No problems on our end. Here is the recipe - INGREDIENTS 1 cup of Peanut Butter 1/2 cup water 1 large egg 15.25 ounces Yellow Cake Mix For the frosting: 1 stick margarine (1/2 c.), softened 1/4 cup milk 1-2 tsp vanilla (depending on your taste) 3 tablespoons of cocoa 2-3 cups of 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.

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