Preheat your oven to 400°F and line a baking sheet with parchment paper.
Trim the ends of the Brussels sprouts and cut them in half.
In a bowl, toss the sprouts with 0.5 tbsp of olive oil, half the sea salt, half the black pepper, and all of the garlic powder.
Spread the sprouts on the baking sheet in a single layer and roast for 20-25 minutes until the edges are charred and crispy.
While the sprouts roast, season the chicken breast with the remaining sea salt and black pepper.
Heat the remaining 0.5 tbsp of olive oil in a skillet over medium-high heat.
Sear the chicken for 6-8 minutes per side until the internal temperature reaches 165°F.
Slice the chicken and serve it alongside the roasted Brussels sprouts, finishing the entire dish with a drizzle of balsamic glaze.