1 cup (2 sticks) butter, melted
1 1/2 cups graham cracker crumbs
1 (1 lb.) box confectioners' sugar
1 cup crunchy peanut butter
1 (6 oz.) pkg. chocolate chips, melted (Ghirardelli)

Stir together first four ingredients and press into greased 9x13-inch pan. Top with melted chocolate chips - spread with spatula.

Refrigerate until set.