Peanut Butter Cup Cake Recipe

Ingredients

devil’s food cake mix or recipe below:
3 eggs
1 cup buttermilk
1/2 cup vegetable oil
2 cups chopped peanut butter cups (plus more for garnishing – I used 2 bags)
8 oz. dark chocolate, chopped
1 cup heavy cream
1/2 cup peanut butter
devil's food cake:
2 cups all-purpose unbleached flour
1 1/2 teaspoons baking soda
3/4 teaspoon baking powder
3/4 teaspoon salt
12 tablespoons unsalted butter, at room temperature, plus more for the pans
2 cups plus 2 tablespoons sugar
3/4 cup nonalkalized cocoa powder (not Dutch-processed)
2 teaspoons pure vanilla extract
3 large eggs, at room temperature
1 1/4 cups water
1/4 cup milk

Preparation

Step 1

Preheat oven to 350 degrees. Coat two 9-inch cake pans with non-stick cooking spray. Line with wax paper and coat paper.

In a large bowl, beat cake mix, eggs, buttermilk and vegetable oil on low for 30 seconds. Increase speed to medium-high and beat for 2 minutes. Scrape down sides after 1 minute. Fold in 2 cups of the chopped peanut butter cups. (or make devil's food cake from scratch below and add the 2 cups peanut butter cups)

Pour batter into pans and bake at 350 degrees for about 30 minutes or until toothpick inserted comes out clean.

Cool cakes completely.

Place chopped dark chocolate in a medium bowl. Bring cream just to a boil and then pour over chocolate. Whisk until chocolate melts. Add peanut butter and whisk until smooth.

Trim each cake layer so the tops are flat. Place one layer on a cooling rack and pour 1 cup frosting on top. Spread evenly with a spatula. Add second layer and pour remaining frosting over top and sides of cake. Smooth out with spatula.

Allow frosting to set for a minute and gently press remaining chopped peanut butter cup pieces all over top and sides of cake. Place in refrigerator for about an hour to set. Remove and serve.
And here’s what I did different:

Baked it in two 6″ cake pans instead of the recommended 9″
Made 6 cupcakes with the leftover batter.
Used twice as many peanut butter cups. I went a little crazy with the extra and used them on top of the cake.
Also, I didn’t let it set for an hour in the fridge like recommended. I couldn’t wait that long.

To make the cake: Set a rack in the middle of the oven and preheat to 350 degrees F. Lightly butter two 9-inch round cake pans and line the bottoms with a circle of parchment or wax paper.

In a medium bowl, whisk together the flour, baking soda, baking powder, and salt. Set aside.

In a standing mixer fitted with the paddle attachment, beat the butter at medium speed until smooth, about 2 minutes. Increase the speed to medium-high and slowly add the sugar. Continue beating until light and smooth, about 4 minutes.

Turn the mixer off and scrape down the sides of the bowl with a rubber spatula. Add the cocoa powder and vanilla and beat at medium speed for 1 minute more. (Stop the machine and scrape down the sides of the bowl again, if needed.)

With the mixer running at medium-low speed, add the eggs, one at a time, beating for 1 minute between each addition. Scrape down the sides of the bowl.
Combine the water and milk in a saucepan and bring just to a boil. Remove from the heat.
With the mixer at low speed, add the flour mixture, about a 1/4 cup at a time. Carefully pour the hot liquid into the batter. Remove the bowl from the mixer and, using a large rubber spatula, finish combining the batter until smooth. Divide the batter evenly between the prepared pans. Lightly drop each pan onto the counter to settle the batter.
Set the pans on the middle rack in the oven. Bake until the cakes begin to pull away from the sides of the pans and the center springs back when touched lightly, about 30 to 35 minutes.

Cool the cakes, in the pans, on a rack for 10 minutes. Turn the cake layers out of the pans and cool on the rack. (If not assembling the cake right away, wrap the layers in plastic wrap and store at room temperature for up to 1 day, or freeze for up to 2 months.)