Preheat the oven to 400 degrees F. Line a baking sheet with parchment paper.
In a small bowl, mix the breadcrumbs, parsley, thyme, rosemary, garlic powder, salt, and pepper. Brush the chicken breasts with 1 tablespoon olive oil, then press the herb mixture onto both sides of each breast.
Place the chicken on one side of the baking sheet. On the other side, toss the Brussels sprouts with the remaining tablespoon of olive oil, maple syrup, salt, and pepper. Spread them in a single layer.
Bake for 20 to 25 minutes until the chicken reaches an internal temperature of 165 degrees F and the Brussels sprouts are tender with browned edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing and serving with the roasted sprouts.