Preheat oven to 425 degrees. Brown ground beef in skillet. Spoon 1 C. of sauce into bottom of greased 11x9x2 inch baking dish. Layer 1/2 frozen ravioli on top of sauce. Cover with 1/2 ground beef and 3/4 C. mozzarella cheese. Cover with 1 C. sauce. Repeat layering with pasta and ground beef. Top with remaining sauce, making sure the sauce covers ravioli. Bake covered for 35 minutes. Sprinkle with mozzarella cheese and bake uncovered until cheese is browned and bubbly, about 5 minutes. Garnish with parmesan cheese and parsley.