Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Cut the chicken breast into bite-sized cubes and chop the cauliflower into small, uniform florets.
Place the chicken and cauliflower on the baking sheet, drizzle with olive oil, and season with sea salt, black pepper, and garlic powder.
Toss everything together until evenly coated, then spread into a single layer to ensure even roasting.
Roast for 20 to 25 minutes, flipping halfway through, until the chicken is cooked through and the cauliflower edges are golden and crisp.
While the bites roast, whisk together the Greek yogurt, dried dill, onion powder, and lemon juice in a small bowl to make the ranch dip.
Transfer the roasted chicken and cauliflower to a large mixing bowl, add the buffalo sauce, and toss gently until every piece is well coated.
Serve the warm buffalo bites immediately with the cool ranch dip on the side for dipping.