2 sticks (1 cup) margarine, melted
1 1/4 cups graham cracker crumbs
1 (1-pound) box powdered sugar
2 cups crunchy peanut butter
1 (12-ounce) package semi-sweet chocolate chips
1/4 cup roasted, salted peanuts, crushed

In a mixing bowl, combine first four ingredients to form crust. Press into a greased 9-inch by 13-inch baking pan.
Melt chocolate chips; spread over crust. Sprinkle with peanuts. Chill in refrigerator until firm. Cut into squares for serving.
Note: To make individual Peanut Butter Cups, cupcake liners may be used instead of the pan.