01 - In a bowl, toss the cooked chicken with the basil pesto until evenly coated.
02 - Lay out the tortillas on a clean surface.
03 - On each tortilla, layer a handful of spinach, a portion of pesto chicken, shredded cheese, cherry tomatoes, and red onion if using.
04 - Fold in the sides and roll up tightly to form a wrap.
05 - Lightly toast the wraps in a dry skillet for 2–3 minutes per side until golden and the cheese melts slightly.
06 - Slice in half and serve immediately.