Posted By Newfie2007.

Ingredients.

1/2 c peanut butter
1/3 c butter
1 c sugar
1/4 c brown sugar
2 eggs (or egg substitute)
1 c flour
1 tsp baking powder
1/4 tsp salt
1 c dark (or milk) chocolate chips
1/2 tsp vanilla
Topping
1/2 c chocolate chips
1/3 c peanut butter

Preheat oven to 350 degrees. Beat peanut butter and butter until well combined. Gradually add sugars, and beat until fluffy. Add eggs, or egg substitute, gradually. Mix in flour, baking powder, and salt. By hand, stir in vanilla and chocolate chips. Spread into a buttered 8x8 pan, and place into oven. Bake 30 minutes, or until toothpick inserted in the center comes out clean. Remove from oven and cool completely on a wire cooling rack.
For topping, combine peanut butter and chocolate chips in a small bowl, and melt in the microwave, stirring occasionally. Spread over cooled cake.