Fry bacon in large fry pan until medium crisp. Meanwhile, wash mushrooms and remove stems saving the caps aside. Mince half the stems and discard the rest. Add minced stems to bacon and drippings. Saute for 2 to 3 minutes. Remove from heat and add the remaining ingredients. Firmly stuff the mushroom caps with bacon mixture. Place on a large shallow baking pan with sides such as a jelly roll pan. Bake for 30 minutes at 350° .