Butter a loaf pan. Place the peanut butter chips into a medium bowl.  3. In a heavy 3-quart saucepan, combine sugar, marshmallow crème, evaporated. milk and butter. Cook over med. heat, stirring constantly, until mixture boils; boil and stir 5 minutes.  Remove from heat; stir in vanilla. Immediately stir mixture into peanut butter chips until chips are completely melted; quickly pour into prepared pan. Cool completely.  Remove from pan; place on cutting board. Cut into 1" squares. Store tightly covered. About 5 dozen pieces or about 2 pounds of candy.