Using a large skillet, brown ground round with onion and garlic. Drain. Cook ravioli according to package instructions, except omit salt. Drain well. Add pasta sauce and ravioli to ground round mixture. Stir gently to combine. Place mixture in 2-quart square baking dish. Mix cheeses together and sprinkle on top of ravioli. Bake, covered, in a 350° oven for 15 minutes. Uncover and bake 5 to 10 minutes more, or until mixture is completely heated.