Preheat your oven to 425°F and line a large baking sheet with parchment paper.
Cut the chicken breast into bite-sized cubes and ensure the cauliflower is broken into small, uniform florets.
In a large bowl, toss the chicken and cauliflower with olive oil, sea salt, black pepper, and garlic powder until evenly coated.
Spread the mixture in a single layer on the prepared baking sheet and roast for 20-25 minutes, flipping halfway through, until the chicken is cooked through and the cauliflower is golden and crispy.
While roasting, whisk together the Greek yogurt, lemon juice, and dried dill in a small bowl to create the creamy ranch dressing.
Remove the tray from the oven and transfer the roasted chicken and cauliflower to a clean bowl.
Drizzle with the buffalo hot sauce and toss gently to coat every piece.
Serve immediately with the creamy ranch on the side for dipping.