2 1/2 cups graham cracker crumbs
1 cup peanut butter
1 cup butter, melted
2 cups semi-sweet chocolate chips
2 3/4 cups powdered sugar
Combine the graham cracker crumbs, peanut butter, butter, and powdered sugar in a medium mixing bowl; press into a 9 X 13-inch baking pan.
Melt the chocolate chips in the microwave, stirring every few seconds, until completely melted. Spread melted chips over the peanut butter mixture.
Chill for 5 minutes then cut into bars before chocolate sets completely. Return to refrigerator and chill until chocolate is completely set.