1/2 med. chopped onion
3/4 c. real mayonnaise
10 strips bacon, fried crisp
1 1/2 c. shredded Cheddar cheese
Lg. mushrooms

Mix all together; crumble bacon and add. Wash and de-stem mushrooms. Stuff mushrooms. Place in a 9x13 inch pan. Cover with foil. Bake 20 minutes at 350 degrees. Can be prepared in advance and refrigerated.