01 -
Preheat oven to 350°F (175°C) and grease a bundt pan with cooking spray. In a large bowl, combine chocolate cake mix, chocolate instant pudding, eggs, vegetable oil, water, and melted butter.
02 -
Use a hand mixer to beat the mixture until smooth and well combined. Pour the batter into the prepared bundt pan and bake for approximately 45 minutes, or until a toothpick inserted in the center comes out clean.
03 -
Let the cake cool in the pan for 10 minutes, then invert it onto a cooling rack to cool completely. Once the cake is fully cooled, carefully place it back into the bundt pan. Using a teaspoon or melon baller, scoop out 6 to 8 holes around the bottom of the cake without cutting through the top.
04 -
Using a hand mixer, beat together the softened butter and peanut butter until smooth. Add the powdered sugar and heavy cream, and continue beating on medium speed until the mixture is fluffy. Transfer the filling to a large piping bag.
05 -
Pipe the prepared filling into the scooped-out holes on the bottom of the cake. Carefully invert the cake onto a serving platter.
06 -
Drizzle the cake with melted chocolate and melted peanut butter. Generously sprinkle chopped Reese’s Peanut Butter Cups over the top.