Mushrooms Au Gratin

1/2 lb. mushrooms,
washed and drained
1/4 cup butter
1/4 cup sour cream
1 Tbsp flour
1/2 cup shredded Cheddar cheese

Sauté mushrooms in butter. Place in a baking dish. Mix sour cream, flour and Cheddar cheese and pour over the top of mushrooms. Bake at 350°F until hot and bubbly.