2 c. crunchy peanut butter
1/2 c. butter, melted
1 1/2 c. powdered sugar
1 c. graham cracker crumbs
1/2 c. brown sugar
1 tsp. vanilla

Combine all ingredients and mix well. Press into buttered 9 x 13 inch pan. Melt 1 (12 ounce) package chocolate chips in double boiler. Spread on top. Refrigerate until top is semi-hard and cut into small squares and return to refrigerator.