To make the cheesecake layer: place a 9×13 inch pan on the bottom rack of your oven. Fill the pan with a few inches of water. Preheat the oven to 325 degrees. Spray a 9-inch springform pan with non-stick cooking spray and line the bottom with parchment paper.

With an electric mixer, beat the cream cheese, sugar and salt on medium speed until smooth. On low speed, mix in the eggs, one at a time until well blended.

Mix in the vanilla and sour cream. Fold in the chopped peanut butter cups.

Spread the batter evenly in the springform pan. Bake for 45-50 minutes or until the cheesecake is set. Cool on wire rack for 10-15 minutes. Cool for one hour, then place the cheesecake in the freezer for at least 2 hours.

To make the chocolate cake layers: preheat oven to 350 degrees. Grease and flour 2 9-inch round cake pans.

In a medium bowl, beat the ingredients for the chocolate cake until smooth.

Divide the batter evenly between the prepared pans and bake for about 30 minutes, or until a toothpick inserted in the center comes out clean. Cool completely.

To make the ganache frosting: combine the cream, sugar and corn syrup. Bring to a boil over medium-low heat, whisking until the sugar is dissolved.

Remove the pan from the heat and add the chopped chocolate. Whisk until the chocolate is melted and smooth.

Stir in the chopped butter until completely melted. Transfer the chocolate mixture to a bowl and cool until spreadable, stirring occasionally. The chocolate should be cooled to a frosting-like consistency.

To make the peanut butter frosting: Beat the cream cheese and peanut butter with an electric mixer until smooth. Mix in the vanilla and salt.

Add the powdered sugar, one cup at a time, mixing until smooth. If needed, add milk a tablespoon at a time until frosting reaches desired consistency.

To assemble to cake: Place one chocolate cake layer on a cake platter or large plate. Spread 1/2 cup of the caramel apple dip over the chocolate cake layer.

Remove the cheesecake from the springform pan and place over the caramel layer (you may need to let it sit at room temperature for 5-10 minutes first). If needed, trim the cheesecake layer with a sharp knife so it is the same size as the cake layer.

Spread another 1/2 cup of caramel apple dip over the cheesecake layer. Top with the remaining chocolate cake layer.

Spread the chocolate ganache frosting evenly over the entire cake. Using the peanut butter frosting, pipe a decorative edge around the top of the cake. (Alternately, you could just spread a layer of peanut butter frosting over the top of the cake. The decorative options are really up to you). Top the cake with additional chopped peanut butter cups, if desired.