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+ servings
A square piece of peanut butter cake on a white plate topped with chocolate frosting and chopped peanut butter cups.
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5 from 28 votes

Peanut Butter cake with a cake mix

This easy peanut butter cake starts with a cake mix, and is the easiest way to make a delicious peanut butter cake! It's a peanut butter lovers dream, it's so moist, and delicious!
Servings: 15
Calories: 448kcal


  • 15.25 oz boxed yellow cake mix (can substitute a white cake mix)
  • 1 1/4 cup milk
  • 1/3 cup vegetable oil
  • 1/2 cup creamy peanut butter
  • 3 large eggs
  • 2 cups frosting (chocolate or peanut butter are great)
  • 1 cup chopped peanut butter cups


  • Preheat the oven to 350 degrees Fahrenheit. Grease a 9x13 pan with nonstick spray.
  • Add all the ingredients to a large bowl and stir them together until combined. Continue mixing the mixture for 1-2 minutes.
  • Pour the mixture into the prepared cake pan and smooth the top evenly.
  • Place the cake in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted in the middle comes out clean, or with a few moist crumbs.
  • Remove the cake from the oven and let it cool completely.
  • Frost the cake with your choice of frosting. Sprinkle chopped peanut butter cups over the top of the frosting if desired.


Calories: 448kcal | Carbohydrates: 57g | Protein: 7g | Fat: 22g | Saturated Fat: 9g | Trans Fat: 1g | Cholesterol: 40mg | Sodium: 395mg | Potassium: 185mg | Fiber: 2g | Sugar: 42g | Vitamin A: 98IU | Vitamin C: 1mg | Calcium: 109mg | Iron: 1mg