In small bowl, mix condensed milk and peanut butter. Pour evenly over baked crust, carefully spreading to edges. Sprinkle chopped peanut butter cups, chocolate chips, peanut butter chips and peanuts evenly over top. Bake 18 to 22 minutes or until bubbling along edges. Cool completely on cooling rack, about 1 hour. Cut into 6 rows by 4 rows.