Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a small mixing bowl, whisk together the buffalo hot sauce and melted ghee until emulsified.
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 top.
Sprinkle the diced red onion and shredded mozzarella cheese over the chicken.
Bake for 8 to 10 minutes, or until the cheese is bubbly and the edges of the tortilla are golden and crisp.
While the pizza bakes, stir together the Greek yogurt, dried dill, garlic powder, sea salt, and black pepper to create the ranch dressing.
Remove the pizza from the oven, garnish with thinly sliced celery for a fresh crunch, and finish with a drizzle of the yogurt ranch.