8 oz. medium shells, cooked
1 1/2 lb. ground round beef
1/2 lb. Italian sausage, casings removed
1 medium onion, diced
1 lb. fresh mushrooms, sliced
1 (1 lb.) jar Ragu sauce
1 large can Italian tomatoes, sliced
1 lb. sour cream
1 pkg. sliced Provolone cheese
1 pkg. sliced Mozzarella cheese

Mix first 5 ingredients. Add Ragu sauce and tomatoes. Simmer the sauce for 45 minutes. Layer: 1/4 sauce, 1/4 shells, 1/4 sour cream, 1/4 Provolone cheese and 1/4 Mozzarella cheese. Repeat layers until all items have been used. Top with grated Romano cheese.

Bake 30 to 45 minutes at 350°F.