1 c. peanut butter chips
1 (14 oz.) can sweetened condensed milk
1 tsp. vanilla extract
1 c. semi-sweet chocolate chips

Line an 8-inch square pan with foil. Place peanut butter chips and 2/3 cup sweetened condensed milk in microwave safe bowl. Microwave until chips are melted and mixture is smooth; about 1 to 1 1/2 minutes. Stir in 1/2 teaspoon vanilla. Spread evenly in foiled pan. Place remaining sweetened condensed milk and chocolate chips in microwave safe bowl. Repeat microwave procedure. Stir in remaining vanilla. Spread over peanut butter mixture. Cover and chill until firm. Cut into 1 inch squares. Cover and store in refrigerator.