Ingredients

• 4 Portobella caps
  Vegetable oil 
• 1 medium onion, sliced 
• 1 pound ground beef, pork,or lamb
• Salt and pepper to taste
• 3/4 cup barbecue sauce 
• 4 slices mozzarella or Monterey Jack cheese 

Preheat the oven to 350*F 
Brush the mushroom caps with oil, place on baking sheet and bake for 2 minutes. 
Meanwhile, heat 1 tablespoon oil in medium skillet and saute the onion for 1 minute. Add the ground meat and cook until the meat is done; drain. Season with salt and pepper to taste. Stir in the barbecue sauce. 
Remove the caps from the oven and cover with the meat mixture. Cover each with a slice of cheese and return to the oven until cheese melts, about 1 minute. Serve immediately. 
Serves 4.