Preheat oven to 350. Butter baking dish. Arrange mushrooms in dish stemmed side down. Melt butter in pan. Blend in flour and cook 3 minutes stirring constantly. Pour in half and half and bring to a boil.Mix in chicken stock and pepper and return to boil Pour sauce over mushrooms. Sprinkle with bread crumbs and bake 30 min. Sprinkle with cheese and bake 5 minutes
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