In a medium bowl, combine the shredded chicken, mashed avocado, garlic powder, salt, and black pepper. Mix until well combined.
Lay out the tortillas on a clean surface. Spread 1 tablespoon of ranch dressing on each tortilla.
Evenly distribute the chicken and avocado mixture among the tortillas, placing it in the center.
Top each with cherry tomatoes, shredded lettuce, and red onion.
Fold in the sides of the tortilla and then roll it up tightly from the bottom to the top.
Slice each wrap in half and serve immediately, or wrap in foil for later.