Cut the chicken breast into small, uniform bite-sized cubes to ensure even cooking and easy wrapping.
Season the chicken pieces thoroughly with half of the sea salt, black pepper, garlic powder, and onion powder.
Heat the olive oil in a non-stick skillet over medium-high heat; once shimmering, add the chicken and sauté for 6-8 minutes until golden brown and cooked through.
While the chicken cooks, prepare the clean ranch by whisking together the Greek yogurt, lemon juice, dried dill, and the remaining salt, pepper, garlic, and onion powder in a small bowl.
Briefly warm the tortilla in a dry pan for 30 seconds per side until pliable and soft.
Assemble the wrap by spreading the ranch dressing across the center of the tortilla, then layering the mixed greens, diced tomatoes, avocado slices, and the warm sautéed chicken.
Fold in the sides of the tortilla and roll tightly from the bottom up, then slice diagonally to serve.