Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Toss the cauliflower florets with olive oil, sea salt, and black pepper on the prepared baking sheet until evenly coated.
Roast the cauliflower for 20 minutes, turning halfway through, until the edges are tender and slightly charred.
While the cauliflower roasts, poach or pan-sear the chicken breast until fully cooked, then shred it into bite-sized pieces using two forks.
In a large mixing bowl, combine the roasted cauliflower and shredded chicken with the buffalo sauce until everything is well coated.
Spread the mixture back onto the baking sheet and bake for an additional 5 minutes to allow the glaze to set and become tacky.
In a small bowl, whisk together the Greek yogurt, blue cheese crumbles, garlic powder, and finely chopped chives to create the dip.
Serve the warm buffalo cauliflower and chicken bites immediately with the chilled blue cheese dip on the side.