Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into small, bite-sized cubes and break the cauliflower into similarly sized florets.
In a large mixing bowl, combine the chicken and cauliflower with olive oil, garlic powder, sea salt, and black pepper, tossing until evenly coated.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring enough space for the ingredients to roast rather than steam.
Bake for 18-22 minutes, or until the chicken is cooked through and the cauliflower edges are golden and tender.
While roasting, prepare the dip by whisking together the Greek yogurt, blue cheese crumbles, lemon juice, and chopped chives in a small bowl.
Remove the tray from the oven, transfer the chicken and cauliflower to a clean bowl, and toss with the buffalo sauce until every piece is zesty and coated.
Serve the warm buffalo bites immediately with the chilled blue cheese dip on the side.