01 - Preheat a grill pan or skillet over medium-high heat until hot.
02 - Brush chicken breasts with olive oil and coat evenly with salt, black pepper, and garlic powder on both sides.
03 - Place chicken on the hot pan and cook for 6-7 minutes per side until internal temperature reaches 165°F. Transfer to a cutting board and let rest for 5 minutes before slicing into thin strips.
04 - In a large mixing bowl, combine chopped romaine lettuce with Caesar dressing. Toss thoroughly until leaves are evenly coated. Add cherry tomatoes and red onion if desired.
05 - Lay tortillas flat on a clean surface. Divide dressed lettuce evenly among all four tortillas. Top each portion with sliced grilled chicken and sprinkle with 2 tablespoons of Parmesan cheese per wrap.
06 - Add freshly ground black pepper to taste. Fold in both sides of each tortilla, then roll tightly from bottom to top to form a secure cylinder.
07 - Cut each wrap diagonally in half and serve immediately. For later consumption, wrap tightly in aluminum foil to maintain freshness.