
Preheat oven to 400 degrees F.
Grease a shallow baking dish.
In a medium skillet saute the sliced mushrooms with butter over medium-high heat (if using garlic add in with the mushrooms).
In a small bowl, blend together sour cream, salt, pepper and flour.
Add to the mushrooms in the pan.
Heat until JUST beginning to boil.
Transfer to a baking dish.
Sprinkle with chopped parsley and cheese.
Bake for about 10-15 minutes.