1. Preheat oven to 350°F and spray three 9-inch round cake pans with baking spray.

2. In a mixing bowl, combine cake mix, milk, butter, and eggs until fully blended.

3. Divide batter between the pans and bake for 25–30 minutes. Let cool.

4. Once cooled, trim domes off cakes to make layers flat.

5. Cream together butter, peanut butter, powdered sugar, vanilla, and salt. Add cream until desired consistency.

6. Heat heavy cream in a small saucepan until steaming, pour over chocolate chips, let sit for 1 minute, and whisk into ganache.

7. Place first cake layer on a plate, frost the top, and stack next layers, frosting each.

8. Frost top and sides of entire cake.

9. Use piping bag with star tip to decorate the top with frosting swirls.

10. Pour ganache into a squeeze bottle and drip over the cake edge, then fill the center.

11. Let ganache set for 10 minutes.

12. Peel Hershey bar to create chocolate shavings and place on top with Reese’s cups.