Chicken Casserole - cooking recipe

Ingredients

1 medium onion
1 Tbsp. butter
1 can cream of chicken soup
1/2 c. milk
1/2 c. diced, cooked chicken
1/2 c. mushrooms (optional)
1 c. noodles, cooked and drained

Preparation

Brown onion (chopped) in butter.
Combine with other ingredients.
Pour in 1-quart casserole.
Top with 1/2 cup shredded cheese.
Bake for 25 minutes at 375\u00b0.