Chicken Noodle Casserole

Rous, tablespoon butter in saucepan, three tablespoons flour, mix/cook, add 2 cups broth.  Simmer with 1-2 cups each of cooked chopped chicken and peas. 
Cooked noodles on bottom of baking dish, a little cheese, then chicken  sauce,  then cup of cheese grated on top.