Cook macaroni according to package directions. Meanwhile, in a large skillet, cook beef over medium heat until no longer pink; drain. Stir in the tomatoes, tomato sauce, gravy, onion and garlic powder.
Drain macaroni; add to beef mixture.
Transfer to a greased shallow 3-qt. baking dish.
Bake, uncovered, at 350° for 25-30 minutes or until heated through.
