1 1/2 c. powdered sugar
1 c. brown sugar
1 1/2 c. peanut butter
1/4 c. butter

Mix all ingredients together and spread into a 13 x 9 pan. Melt 1 cup chocolate chips with 1/4 cup butter. Spread over bars. Let cool. Cut, store in refrigerator (taste just like "Reeses" peanut butter cups.)