Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Trim and halve the Brussels sprouts, slice the carrot into rounds, and cut the red onion into thick wedges.
Place the vegetables on the baking sheet and toss with 0.5 tbsp of olive oil and half of the sea salt and black pepper.
Roast the vegetables for 20-25 minutes, tossing halfway through, until they are tender and have developed charred, crispy edges.
While the vegetables roast, season the chicken breast evenly on both sides with garlic powder, smoked paprika, and the remaining salt and pepper.
Heat the remaining 0.25 tbsp of olive oil in a non-stick skillet over medium-high heat and sear the chicken for 6-7 minutes per side until cooked through.
Drizzle the honey over the chicken during the final minute of searing, turning the breast to coat it in a glossy, golden glaze.
Plate the seared chicken alongside the roasted vegetable medley and serve immediately.