Preheat your oven to 425°F and line a large baking sheet with parchment paper to prevent sticking.
In a large mixing bowl, whisk together the melted ghee, hot sauce, garlic powder, onion powder, sea salt, and black pepper until the marinade is emulsified.
Cut the chicken breast into bite-sized cubes and add them to the bowl along with the cauliflower florets, tossing thoroughly to ensure every piece is well-coated.
Spread the chicken and cauliflower in a single layer on the prepared baking sheet, leaving space between pieces to ensure they roast and crisp up properly.
Bake for 20 to 25 minutes, flipping the pieces halfway through the cooking time, until the chicken is cooked through and the cauliflower is tender with charred edges.
While the bites are roasting, prepare the dipping sauce by stirring together the Greek yogurt, lemon juice, and finely chopped fresh dill in a small bowl.
Remove the baking sheet from the oven and serve the hot buffalo bites immediately with the chilled yogurt dip and fresh celery sticks on the side.