1 c. cream of mushroom soup
1/2 c. milk
1 (7 oz.) can tuna, drained
2 c. cooked noodles
Chopped onion to taste
Bread crumbs for topping

In 1 quart casserole, stir soup until smooth. Blend in milk. Add tuna and noodles; stir until smooth. Top with bread crumbs. Bake at 350 degrees for 30 minutes.