1 cup Reese's Peanut Butter Chips
1 can (14 oz.) Eagle Brand Sweetened Condensed Milk (not evaporated milk), divided
1 teaspoon vanilla extract, divided
1 cup Hershey's Semi-Sweet Chocolate Chips
Line 8-inch square pan with foil. In small microwave-safe bowl, place peanut butter chips and 2/3 cup sweetened condensed milk. Microwave at HIGH 1 to 1-1/2 minutes, stirring after 1 minute, until chips are melted when stirred. Stir in 1/2 teaspoon vanilla; spread evenly into prepared pan.
In small microwave-safe bowl, place remaining sweetened condensed milk and chocolate chips; repeat above microwave procedure. Stir in remaining 1/2 teaspoon vanilla; spread evenly over peanut butter layer. Refrigerate until firm, about 2 hours.
Turn fudge onto cutting board; peel off foil. Cut into squares. Store tightly covered in refrigerator.
About 4 dozen pieces or 1-1/2 pounds.