Easy Pasta Bake

1 lb. ground beef
5 cups cooked pasta (We usually use rigatoni or penne)
1 jar (30 oz) spaghetti sauce
1/2 cup grated Parmesan cheese
8 oz. shredded mozzarella cheese

Cook ground beef in skillet; drain. Stir in cooked pasta, spaghetti sauce and grated Parmesan cheese. Spoon into 13x9 baking dish. Top with mozzarella cheese. Bake at 375 degrees for 20 minutes.