Clean off mushrooms with semi damp towel to remove dirt. But do not rinse with water! Remove stem and sit mushrooms upside down on a sheet pan lined with parchment paper. Set aside.

Melt butter and add minced garlic and allow to sit and infuse butter.

Next pinch as much mozzarella cheese into the mushroom as possible. You will have to push and pack. Next add as much cooked bacon as will stay on. Again, pack down. Sprinkle Parmesan cheese and green onion. Bake in the oven at 375 degrees until cheese is nice and melted!