Hi Cathy, Here is a recipe we like very well,

Stuffed Mushroom Caps

1 lb. mushrooms
1 stick margarine or less
1/2 cup finely chopped onions
1/2 cup finely chopped green pepper
The chopped stems of mushroom
1/2 tsp. worchestershire sauce.

We enjoy this one but if you do a search I'm sure you would find other good ones.