Brown beef with onions and garlic; srain off fata.
Stir in spaghetti sauce, stewed tomatoes and
mushrooms. Simmer about a half hour.
Layer as follows in a Dutch oven or casserole: half
shells, half sauce, half sour cream, provolone cheese.
Repeat, ending with mozzarella. Bake a half hour or so
at 350F. until heated through and bubbly.