Preheat your oven to 400°F and line a large baking sheet with parchment paper.
In a small mixing bowl, whisk together the buffalo hot sauce and melted ghee until well combined.
Toss the cooked, shredded chicken breast in the buffalo sauce mixture until every piece is thoroughly coated.
Place the whole wheat tortilla on the prepared baking sheet and spread the buffalo chicken evenly across the surface.
Top the chicken with the shredded mozzarella cheese and the finely diced red onion.
Bake for 8-10 minutes, or until the cheese is melted and bubbly and the tortilla edges are golden and crispy.
While the pizza bakes, prepare the ranch drizzle by stirring together the Greek yogurt, dried dill, garlic powder, sea salt, and black pepper.
Remove the pizza from the oven, garnish with the diced celery for a fresh crunch, and finish with a drizzle of the yogurt ranch before slicing.