Lg. pkg. shells for stuffing
1 lb. Mozzarella cheese
1 lb. Cheddar or Colby Longhorn
1 pt. sour cream
1 lg. pan pizza sauce
1 lg. can tomato sauce

Cook shells as directed on package. Shred cheese and mix with sour cream. Stuff each shell. Mix sauce and pour over shells in large casserole. Bake at 350 degrees for 45 minutes.