Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Cut the chicken breast into bite-sized 1-inch cubes and break the cauliflower into small, uniform florets.
In a large mixing bowl, toss the chicken cubes and cauliflower florets with avocado oil, garlic powder, onion powder, sea salt, and black pepper until every piece is well-coated.
Spread the mixture in a single layer onto the prepared baking sheet, ensuring there is enough space between pieces to allow them to roast rather than steam.
Roast in the oven for 20-25 minutes, flipping the pieces halfway through, until the chicken is cooked through and the cauliflower edges are golden and crispy.
While the tray is roasting, whisk together the Greek yogurt, dried dill, and lemon juice in a small bowl to create a clean-eating ranch dipping sauce.
Remove the baking sheet from the oven and drizzle the buffalo sauce over the roasted chicken and cauliflower, tossing gently with a spatula to coat.
Return the tray to the oven for an additional 2-3 minutes to allow the sauce to glaze and set onto the bites.
Serve the buffalo bites immediately while hot, with the cooling Greek yogurt ranch dip on the side.