- Preheat grill.
- Season chicken with salt and pepper and grill over medium heat for 5 to 8 minutes on each side or until cooked through.
- Top each chicken filet with 2 slices cheese; heat on grill until cheese melts.
- Spread mayonnaise on bottom half of each roll and top with lettuce, tomato, bacon, chicken and avocado.
- Close each sandwich with top half of roll and serve.