Cheese-Stuffed Mushrooms
["1 egg yolk", "1 (8 oz.) pkg. cream cheese, softened", "1/2 small onion, chopped", "1/2 lb. fresh mushrooms", "Parmesan cheese"]
["Preheat oven to 350\u00b0.", "Wash mushrooms.", "Remove stems and mince finely.", "Mix egg yolk with cream cheese.", "Add onion and minced stems.", "Stuff mushroom caps with mixture.", "Place on cookie sheet and sprinkle with Parmesan cheese.", "Bake 10 minutes.", "(May be made ahead of time.)"]
["egg yolk", "cream cheese", "onion", "fresh mushrooms", "Parmesan cheese"]