Preheat your oven to 425°F and line a large baking sheet with parchment paper.
Cut the chicken breast and cauliflower into bite-sized pieces of similar size to ensure even cooking.
In a large bowl, whisk together the melted ghee and buffalo hot sauce, then set aside half of this mixture in a small ramekin.
Toss the chicken and cauliflower in the remaining sauce in the large bowl until every piece is well coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring pieces are not overcrowded.
Roast for 20 to 25 minutes, flipping the pieces halfway through, until the chicken is cooked through and the cauliflower edges are slightly charred.
While the tray is roasting, prepare the high-protein ranch dip by mixing the Greek yogurt, garlic powder, onion powder, sea salt, black pepper, dried dill, and lemon juice in a small bowl.
Remove the tray from the oven, drizzle with the reserved buffalo sauce for extra zing, and serve immediately with the cool yogurt dip.