HEAT oven to 375ºF.
BROWN meat in large skillet; drain. Add VELVEETA and seasonings; cook 5 min. or until VELVEETA is completely melted and mixture is well blended, stirring after 3 min.
PLACE bread in single layer on baking sheet; top with meat mixture and mozzarella.
BAKE 10 min. or until mozzarella is melted.