2 1/2 c. powdered sugar
1 3/4 c. graham cracker crumbs
1 c. peanut butter
2 sticks melted butter
large bag chocolate chips

Butter 9 x 13 inch pan. Mix sugar, graham crumbs, peanut butter and melted butter. Mix well with a fork and pat into pan. Melt chocolate chips and spread evenly over top. Freeze or refrigerate until firm; cut into squares.