If you have sausage meat that is in casings, remove the casings from the meat. Cook the sausage, celery, onion and garlic in a 10 inch skillet over medium heat for 10 minutes, stirring occasionally, until the sausage is no longer pink. Drain of the fat.
Mix the sausage mixture with the remaining ingredients in an ungreased 3 quart casserole. Bake at 400ºF, uncovered, for about 45 minutes, stirring once, until everything is hot and bubbly.