Who can resist a stuffed mushroom? Pass a tray of these at your next party and watch them disappear. Stuffed mushrooms are great to make ahead and reheat just before serving. Serve them as an appetizer or a side dish.
Preheat the oven to 350 degrees F. Clean the mushrooms. Remove the stems and set the caps aside. Finely chop the stems.
In a medium-size skillet, melt the butter over medium heat. Add the chopped mushroom stems, celery, and onion and saute until the onion is limp and transparent, about 5 minutes. Stir in the bread crumbs, salt, and pepper.
Stuff the mushroom caps with the sauteed mixture and bake for 12 minutes. Or microwave at 50 percent power for 6 minutes, turn, and cook for another 6 minutes. Serve warm.