Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast into small, uniform bite-sized pieces and sauté in a non-stick pan over medium heat until fully cooked through.
In a small mixing bowl, toss the cooked chicken with 1.5 tablespoons of the buffalo sauce until every piece is well coated.
Place the whole wheat tortilla on the prepared baking sheet and spread the remaining 0.5 tablespoon of buffalo sauce thinly across the surface to act as the base.
Layer the buffalo chicken, finely diced celery, and thinly sliced red onion onto the tortilla, then sprinkle evenly with the shredded mozzarella cheese.
Bake for 8-10 minutes until the cheese is bubbly and the edges of the tortilla have become golden brown and crispy.
While the pizza is in the oven, whisk together the Greek yogurt, dried dill, garlic powder, sea salt, and black pepper in a small bowl to create a clean-eating ranch drizzle.
Remove the pizza from the oven, drizzle the yogurt ranch over the top in a zigzag pattern, and slice into four wedges before serving.