Warm the tortillas for 15 to 20 seconds in the microwave or on a skillet until soft and flexible.
In a large bowl, combine the shredded chicken, ranch dressing, chili powder, garlic powder, salt, and black pepper. Toss until the chicken is evenly coated.
Fold in the diced avocado, cheddar cheese, tomato, red onion, and cilantro.
Lay a tortilla flat and place shredded lettuce down the center.
Spoon the chicken mixture over the lettuce.
Fold in the sides of the tortilla, then roll tightly into a burrito.
Heat a large skillet over medium heat.
Place the burritos seam-side down and toast for 2 to 3 minutes per side until golden brown and lightly crispy.
Slice in half and serve immediately.