Directions

1. In a mixing bowl, combine the dry cake mix, butter and egg; beat until no longer crumbly, about 3 minutes. Stir in the peanut butter cups. Press into a greased 13-in. x 9-in. x 2-in. baking pan. Bake at 350 degrees F for 18-22 minutes or until lightly browned.
2. Meanwhile, in a saucepan, combine cornstarch, caramel topping and peanut butter until smooth. Cook over low heat, stirring occasionally, until mixture comes to a boil, about 25 minutes. Cook and stir 1-2 minutes longer. Remove from the heat; stir in peanuts. Spread evenly over warm crust. Bake 6-7 minutes longer or until almost set. Cool completely on a wire rack. Spread with frosting; sprinkle with peanuts. Refrigerate for at least 1 hour before cutting. Store in the refrigerator.