Starting at the top, with a very sharp knife, cut down into each avocado until you hit the pit. Cut completely around the avocado, top to bottom, touching the pit the entire time.
Pull the two halves of the avocado apart and remove the pit with a spoon.
Use the spoon to scoop the avocado out of the skin.
Slice thinly. Set aside.
Lay out 4 flour tortillas on a work surface. Lay ingredients out on 1/2 of the tortilla, in the following order using and equal amount (1/4 of each ingredient) on each tortilla: Cheddar cheese, chicken, tomato, green onion, avocado, bacon, cilantro, Swiss cheese.
Fold the 1/2 of the tortillas that have no ingredients over to cover the ingredients.
Heat a large pan to medium on the stovetop.
Carefully place a quesadilla onto the hot pan. Cook for about 1 - 2 minutes until the tortilla has started to brown and cheese has melted.
Flip the tortilla and brown the other side.
Repeat with remain quesadillas until all are cooked.
Cut into thirds or quarters wedges and serve with sour cream and pico de gallo (See box below for links to recipes from your Favorite Restaurants) or one of the other sauces on this site (See links above).