Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Trim the woody ends off the Brussels sprouts and slice each sprout in half vertically.
In a small mixing bowl, whisk together the maple syrup, sriracha, and half of the olive oil until emulsified.
Place the sprouts on the baking sheet, drizzle with the glaze, and season with half of the sea salt and black pepper.
Toss the sprouts to coat thoroughly, then arrange them cut-side down for maximum browning.
Roast for 20-25 minutes, tossing halfway through, until the edges are dark and crispy.
While the sprouts roast, season the chicken breast with garlic powder and the remaining sea salt and black pepper.
Heat the remaining olive oil in a skillet over medium-high heat and sear the chicken for 6-7 minutes per side until the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes before slicing and serving alongside the hot, glazed Brussels sprouts.