2 c. Reese's peanut butter chips
2 (14 oz.) cans sweetened condensed milk
2 tsp. vanilla extract
2 c. semi-sweet chocolate chips

Line 9x13 inch pan with foil. In small microwave-safe bowl, place peanut butter chips and 1 can sweetened condensed milk. Microwave at high (100%) 1 to 1 1/2 minutes, stirring after 1 minute, until chips are melted and mixture is smooth when stirred. Stir in 1 teaspoon vanilla, spread evenly into prepared pan.

In microwave-safe bowl, place remaining sweetened condensed milk and chocolate chips; repeat above microwave procedure. Stir in remaining 1 teaspoon vanilla; spread evenly on peanut butter layer. Cover, chill until firm. Cut into 1-inch squares. Cover. Store in refrigerator.