Preheat oven to 400°F and line a large baking sheet with parchment paper.
Halve the Brussels sprouts and dice the chicken breast into bite-sized pieces.
Cut the thick-cut bacon into 1-inch lardons.
In a large bowl, toss the sprouts, chicken, and bacon with olive oil, sea salt, black pepper, and garlic powder until evenly coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring space between pieces for even browning.
Roast for 20 minutes, stirring halfway through, until the sprouts are tender and the bacon begins to crisp.
Drizzle the maple syrup over the roasted mixture and toss with a spatula to coat every piece.
Roast for an additional 5 minutes until the glaze is sticky and the bacon is perfectly golden.