18 to 20 medium mushrooms
6 slices bacon
1 sm. onion
3 T. mayonnaise or salad dressing
2 oz. (1/2 c.) shredded Cheddar cheese

Heat oven to 350F. Wash and drain mushrooms, remove stems.
Finely chop stems.
In medium skillet, cook bacon until crisp. Remove bacon, drain on paper towel.
Crumble bacon, set aside. Discard all but 2 tablespoons drippings from skillet.
Saute mushroom stems and onion in bacon drippings until tender, drain thoroughly.
In small bowl, blend bacon, mushroom stems, onion, mayonnaise and cheese.
Fill mushroom caps with stuffing mixture. Place mushrooms on ungreased pan.
Bake at 350 degrees for 15 to 20 minutes until hot and cheese is melted.