Spread ½ tablespoon of ranch dressing on each slice of sandwich thin. Put 4 slices aside, these will be your top pieces. Add 1/8 cup of spinach leaves onto each of your 4 bottom slices.
Layer each sandwich bottom with 3-4 slices of Foster Farms All Natural Sliced Turkey, tomato, Monterey Jack cheese, 1 slice of bacon (I like to cut it in half to cover more surface area), and 1/4 of the sliced avocado. Top each sandwich with 1/8 cup of spinach and one of the reserved sandwich top pieces.