2/3 c. butter
2/3 c. chunky peanut butter
6 c. powdered sugar
1/3 c. milk
1 tsp. vanilla

In a large microwave-safe bowl, microwave on High the butter and peanut butter (2 minutes). Stir until blended. Add remaining ingredients; stir until the lumps of sugar disappear. Microwave again on High ( 1 1/2 minutes); stir. Pour into buttered 9-inch square baking pan and plastic container. Store refrigerated. Cut into squares.