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 cubes and chop the cauliflower into small, uniform florets.
In a large mixing bowl, toss the chicken and cauliflower with the extra virgin olive oil, sea salt, and black pepper until every piece is lightly coated.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring they aren't overcrowded to allow for even browning.
Roast in the oven for 20 minutes, or until the cauliflower starts to soften and the chicken is nearly cooked through.
While the tray is roasting, prepare the high-protein ranch dip by whisking together the Greek yogurt, dried dill, and garlic powder in a small bowl.
Remove the baking sheet from the oven and drizzle the buffalo sauce over the chicken and cauliflower, tossing gently with a spatula to coat.
Return the tray to the oven for an additional 5 to 10 minutes until the sauce is bubbly and the chicken reaches an internal temperature of 165°F.
Serve the warm buffalo bites immediately with the chilled yogurt dip and fresh celery sticks on the side.