Super Diet Dr. Pepper Chocolate Peanut Butter Cake

This is the easiest cake I have ever made. No eggs no oil and if you want you can use sugar free icing in place of the powdered sugar and semi-sweet chocolate. Serve with Breyers Carb Smart Vanilla Ice Cream.
Tip: You can use any Diet Soda you want.

1 box sugar free chocolate cake mix
12 ounces diet cola
Icing
1 package cream cheese softened
3/4 cup powdered sugar
1/2 cup creamy peanut butter
1/2 cup peanut butter, creamy
8 ounces Whip topping mix, thawed and divided
6 squares semi-sweet chocolate
1.
Preheat oven to 350 degrees.

2.Combine ingredients in a large bowl. Whisk thoroughly and transfer to a baking pan sprayed with nonstick spray; bake in the oven until a knife inserted into the center comes out clean. (Refer to cake-mix box for pan size and approximate bake time.)

4.BEAT cream cheese and sugar in large bowl with mixer until well blended. Add peanut butter; mix well. Blend in 1 cup COOL WHIP; spread onto cake.

MELT chocolate as directed on package. Mix with remaining COOL WHIP; spread over cake. Refrigerate 1 hour.
Serve with ice cream.