All that need to be done is to brown the meat with the onion. And please drain the fat and rinse under hot water. Make sure to cook the spaghetti according to the package directions. Immediately drain and stir it together with the meat, sauces and extra spices. Once done, put it into a casserole dish and top with cheese. Finally, bake at 350 degrees for until hot and bubbly, about 30 minutes.