1 pkg. macaroni and cheese
1 can tuna
1 can cream of mushroom soup
1/2 stick butter
3/4 c. milk
1 c. partially cooked peas, optional

Cook macaroni until tender. Drain. Add milk and butter. Flake tuna with a fork. Stir in tuna and mushroom soup. Stir in peas if desired.

Bake in a 2 quart casserole for 15 to 20 minutes at 375 degrees.