Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Trim the ends of the Brussels sprouts and slice them in half vertically.
Toss the sprouts on the baking sheet with half of the olive oil and a pinch of the sea salt and black pepper.
Spread the sprouts in a single layer, cut-side down, and roast for 20 to 25 minutes until they are tender and the outer leaves are crispy and charred.
While the sprouts roast, season the chicken breast evenly with garlic powder and the remaining salt and pepper.
Heat the remaining olive oil in a medium skillet over medium-high heat and sear the chicken for 6 to 7 minutes per side until the internal temperature reaches 165°F.
In a small glass bowl, whisk together the balsamic vinegar and honey until well combined.
Remove the sprouts from the oven and the chicken from the pan, then drizzle the balsamic glaze over both, tossing the sprouts gently to coat before serving.