1 (1 lb.) box confectioners' sugar
1/2 c. milk
1 (7 1/2 oz.) jar marshmallow fluff
1 (12 oz.) jar peanut butter

Bring milk and confectioners' sugar to a rolling boil. Boil 1 1/2 minutes, stirring constantly. Remove from heat and add peanut butter and marshmallow fluff. Stir until mixed well. Pour into a greased 9 x 9 inch pan. Cool and cut into squares.