Preheat your oven to 400°F and line a baking sheet with parchment paper.
Cook the chicken breast in a skillet over medium heat until it reaches an internal temperature of 165°F, then shred it thoroughly with two forks.
In a small bowl, toss the shredded chicken with the buffalo sauce and melted ghee until every piece is well coated.
Place the whole wheat tortilla on the baking sheet and toast in the oven for 2 minutes per side until it begins to crisp.
Spread the buffalo chicken mixture, diced red onion, and shredded mozzarella cheese evenly across the toasted tortilla.
Bake the pizza for 8 to 10 minutes until the cheese is bubbly and the edges of the tortilla are a deep golden brown.
While the pizza bakes, whisk together the Greek yogurt, dried dill, garlic powder, sea salt, and black pepper to create a clean ranch drizzle.
Remove the pizza from the oven, top with the diced celery for a fresh crunch, and finish with a drizzle of the prepared yogurt sauce before slicing.