Preheat your oven to 425°F and line a large baking sheet with parchment paper.
In a large bowl, toss the cauliflower florets with olive oil, garlic powder, sea salt, and black pepper until evenly coated.
Spread the cauliflower in a single layer on the baking sheet and roast for 20-25 minutes, flipping halfway through, until the edges are crispy and golden.
While the cauliflower roasts, season the chicken breast with a pinch of salt and pepper, then grill or pan-sear over medium-high heat for 6-7 minutes per side until fully cooked.
In a small ramekin, whisk together the Greek yogurt, dried dill, and lemon juice to create a clean, high-protein ranch dipping sauce.
Remove the cauliflower from the oven and immediately toss with the buffalo sauce in a clean bowl until well coated.
Slice the grilled chicken into strips and serve alongside the buffalo cauliflower bites with the yogurt ranch on the side.