Peanut Butter Squares

1 cup butter
4 cups icing sugar
1 1/2 cups smooth peanut butter
1 cup graham wafer crumbs
8 oz bag chocolate chips

In large saucepan, melt butter.
Add the next 3 ingredients; blend well.
Press firmly into 11×16″ pan. (Make thicker ones with a 9x13 pan)
On low heat, melt chocolate chips; spread evenly over peanut butter mixture.
Chill till firm, cut & serve.