Wonder Bars (like Reese's)

3/4 C. Margarine, melted
1 ½ C. Peanut butter
1 block of Graham crackers -crushed fine
2 C. Powdered sugar

Topping:
1 C. Chocolate Chips
2 T. margarine
Directions:
Mix melted margarine, peanut butter, crushed crackers and sugar. Press into 9x13 pan. Melt 1 cup chocolate chips with 2 T. margarine. Spread over the top. Cool.