Bacon Stuffed Mushrooms

1 lb fresh mushrooms
2 T. chopped onion
2 T. butter
1 slice bread, torn into small pieces
1 c. (4 oz) shredded cheddar cheese
1 can (3 oz) Oscar Mayer real bacon bits

Remove stems from mushrooms and set aside caps; chop stems.
Cook onions and stems in butter until tender; add bread pieces.
Remove from heat; stir in bacon bits and cheese.
Mound filling in caps; place in shallow baking pan.
Bake in 400 oven 15 min. until cheese is melted.
Makes 15-20 appetizers