Place bacon on baking sheet and bake in 375° oven for 20-25 min.
Remove stem and scrap out gills with a spoon, and wipe down with a damp cloth. Place in a skillet and cook till tender.
I placed a small pot on top to help it make contact with the skillet.
Grate your favorite melting cheese, I used Asadero. Layer: Portabella, cheese, thai garlic chile sauce, chopped cilantro, bacon, and top with more cheese, and the other portabella. I popped mine in the microwave for 1 min to melt cheese.