Cook chicken breast by boiling, baking, or grilling until fully cooked if using raw meat. Let cool, then shred or dice.
Mix the cooked chicken with sweet chili sauce to coat evenly.
Wash and prepare vegetables: shred lettuce or mixed greens, shred carrots, slice cucumber and red onion thinly, slice avocado just before use.
Spread a thin layer of mayonnaise or Greek yogurt on each tortilla if desired.
Layer the greens, then add sweet chili chicken, shredded carrots, cucumber, red onion, avocado, cheese, and cilantro.
Drizzle with lime juice and season with salt and pepper.
Fold the sides of each tortilla inward and roll tightly to enclose filling. Slice in half if desired and serve or wrap for later.