Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Dice the chicken breast into small half-inch cubes and season evenly with the sea salt and black pepper.
In a small non-stick skillet over medium heat, melt the ghee and whisk in the buffalo hot sauce until well combined.
Add the diced chicken to the skillet, sautéing for 5-6 minutes until the chicken is cooked through and the sauce has thickened slightly to coat each piece.
Place the sprouted grain tortilla on the prepared baking sheet and bake for 3-4 minutes until it starts to feel firm and crisp.
Remove the tortilla from the oven and spread any remaining buffalo sauce from the skillet over the surface, leaving a small border for the crust.
Top the tortilla with the buffalo chicken pieces, finely diced red onion, and the shredded part-skim mozzarella cheese.
Return the pizza to the oven and bake for an additional 6-8 minutes until the cheese is melted and bubbly and the edges are a deep golden brown.
While the pizza bakes, stir together the Greek yogurt, garlic powder, and dried dill in a small bowl to create a zesty ranch-style drizzle.
Remove the pizza from the oven, garnish with thinly sliced celery for a fresh crunch, and finish with the prepared yogurt ranch drizzle before slicing.