Preheat your Grill to 350 degrees F.
Core the mushrooms and remove the gills completely.
Sprinkle garlic in each mushroom, followed by bacon, 1/4 cup cheese, more bacon and lastly green onions.
Place on the grates of your Grill and cook for about 20 minutes.
Serve hot. Be careful taking the first bite - they're very juicy! Enjoy!