1 pkg. chocolate cake mix
1/2 c. butter, melted
1/4 c. milk
1 egg
1 c. chopped peanuts, divided
1 (8 oz.) pkg. cream cheese
1 c. peanut butter
1 c. confectioners sugar
1 (14 oz.) sweetened condensed milk
1 1/2 tsp. vanilla
1 (16 oz.) Cool Whip, divided
1/2 c. chocolate chips
4 1/2 tsp. butter
1/2 tsp. vanilla

In bowl, mix cake mix, melted butter, milk and egg. Add 3/4 cup peanuts. Spread in a greased 9 x 13-inch pan.

Bake at 350°F for 30 minutes or until a toothpick comes out clean. Cool. In a mixing bowl, beat the cream cheese, peanut butter, sugar, condensed milk and vanilla until smooth. Fold in 3 cups Cool Whip. Spread over cooled crust. Top with remaining Cool Whip and peanuts. In a microwave-safe bowl, melt the chocolate chips and butter on high for 1 minute or until melted. Stir in vanilla until smooth. Drizzle over cake. Refrigerate.