Make provolone taco shells: Place 1 slice of provolone cheese on a paper plate (needs to be coated or leakproof) grease with the cooking spray or a microwave safe Taco rack holder. Microwave on high for 60 seconds.
Remove from microwave immediately and, if necessary, reform cheese into a circle. Wait 5 seconds for the cheese to cool and then form into a taco shell shape on the edge of a dish or microwave safe taco rack holder. Let cool until set. Repeat for the remaining 2 slices of cheese.
To make the filing: Toss the chicken, avocado, bacon, tomatoes, ranch, and lettuce to combine.
Fill the cooled taco shells with the lettuce mixture. Serve any extra as a side-salad.