2 c. peanut butter chips
2 c. semi-sweet chocolate chips
2 cans sweetened condensed milk
2 tbsp. butter

Spray 9x13x2 inch pan with vegetable oil. Put peanut butter chips and chocolate chips in 2 separate microwave bowls. Pour 1 can of sweetened condensed milk into each bowl. Microwave peanut butter chips on high for 1 1/2 to 2 minutes or until chips are melted and mixture is smooth when stirred. Stir in butter. Immediately pour and spread into pan.

Microwave chocolate chips for 1 1/2 to 2 minutes until melted and mixture is smooth when stirred. Spread chocolate over peanut butter mixture. Cover and chill until firm. Cut into squares.