Dice the chicken breast into bite-sized pieces and place them in a bowl.
Toss the chicken with arrowroot powder, sea salt, and black pepper until each piece is lightly and evenly coated.
Heat the olive oil in a non-stick skillet over medium-high heat.
Add the chicken to the skillet and sear for 5-7 minutes, turning occasionally, until the exterior is golden and crispy.
While the chicken cooks, whisk together the Greek yogurt, dried dill, garlic powder, and onion powder in a small ramekin to make the ranch dressing.
Once the chicken is cooked through, remove the pan from the heat and toss the chicken in the buffalo sauce.
Warm the tortilla briefly in a separate dry pan or microwave for 10 seconds to make it pliable.
Spread the Greek yogurt ranch across the center of the tortilla.
Layer the shredded romaine lettuce and diced tomatoes over the ranch.
Top with the crispy buffalo chicken, fold in the sides of the tortilla, and roll it up tightly.