2 c. shells, uncooked
2 tbsp. butter
1 sm. onion, chopped
1/2 sm. green pepper, chopped
1 can cream of mushroom soup
1 can tuna, flaked
1/2 c. sour cream
1/2 c. milk
1 can mushrooms, drained
1 tbsp. prepared mustard
1 tsp. Worcestershire sauce
Pinch of salt
Crushed potato chips

Cook shells and drain. Rinse. Melt butter and saute onion and green pepper until translucent. Combine with shells, remaining ingredients except for potato chips. Turn into greased 8-cup baking dish and border with chips. Bake at 350 degrees for 25-30 minutes.