Peanut Butter Bar

1 1/2 cup smooth peanut butter
1 1/2 cup graham cracker crumbs
1 stick melted margarine
1 3/4 cup powdered sugar
1 pkg (6oz) chocolate chips
Mix all ingredients except chocolate chips. Spread in a 9x13 pan.

Bake at 350 degrees for 8 minutes.
Spread melted chocolate chips to cover top. Cool until chocolate hardens. Cut into squares. Freeze.