Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into bite-sized 1-inch cubes and ensure the cauliflower is broken into small, uniform florets.
In a large mixing bowl, toss the chicken and cauliflower with the melted ghee, sea salt, and black pepper until evenly coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring enough space between pieces for roasting rather than steaming.
Roast for 20 to 25 minutes, flipping halfway through, until the chicken is cooked through and the cauliflower edges are golden and crispy.
While the base is roasting, prepare the ranch by whisking together the Greek yogurt, dried dill, garlic powder, onion powder, and lemon juice in a small bowl.
Once the chicken and cauliflower are done, remove them from the oven and transfer to a clean bowl.
Drizzle the buffalo hot sauce over the warm chicken and cauliflower, tossing gently to coat every piece.
Serve immediately with the creamy ranch on the side or drizzled over the top.