1/2 lb. melted butter (2 sticks)
1 1/2 c. graham cracker crumbs
1 lb. powdered sugar (7 c. or 1 sm. box)
1 c. peanut butter

Mix all in 9x12 pan, by hand. Press in bottom of pan.

In microwave, melt 12 ounce of semi-sweet chocolate chips with 2 tablespoons butter. Pour over crust; cool until set; cut into bars.

(Although you don't use any Reeses Peanut Butter cups in this recipe, that's exactly what they taste like.)