Peanut Butter Squares

1 c. margarine
1 c. peanut butter
1 tsp vanilla
3 1/2 c. icing sugar
1 c. chocolate chips
1/2 c. peanut butter

Melt together first 2 ingredients in the microwave.  Add vanilla & icing sugar.  Mix.  Spread in greased 9x13 pan. ( I use a 9x11)  Melt chocolate chips & peanut butter in microwave.  Spread over the bottom part.  Chill.  Cut before they get too hard. (about 20 mins)