Directions

1. Preheat oven to 350 degrees F (175 degrees C).
2. To make Pastry: Cream together 2/3 cup butter and brown sugar. Stir in the flour, baking powder, salt, and baking soda until well blended.
3. Separate the eggs and beat in the yolks. Add in 1/2 teaspoon vanilla and mix well.
4. Press mixture into the bottom of a 9 x 13 inch pan. Bake for 12 minutes or until golden brown.
5. To make the Topping: In a medium bowl, mix together the powdered sugar, chopped peanuts, peanut butter, egg whites, and 1/2 teaspoon of vanilla. Melt 1/4 cup of butter or margarine and stir into mixture.
6. Turn off oven and remove pan. Let cool for about 2 minutes. Spread topping over pastry. Sprinkle chocolate chips over topping and return to warm oven for 2 or 3 minutes. Spread chocolate over topping, like a frosting. Let cool before cutting.