Preheat your oven to 425°F.
Pat the chicken breast dry using paper towels and place it on a baking sheet lined with parchment paper.
In a small bowl, combine the olive oil, lemon juice, minced garlic, dried thyme, dried rosemary, salt, and pepper.
Brush the mixture evenly over the chicken breast, ensuring it’s well-coated with the herb and lemon marinade.
In a separate bowl, toss the halved Brussels sprouts with a splash of olive oil, salt, and pepper.
Spread the Brussels sprouts on another baking sheet in a single layer.
Place both baking sheets in the oven. Roast the Brussels sprouts for about 20-25 minutes until they are golden and crispy on the edges, stirring halfway through.
Roast the chicken breast for approximately 25-30 minutes, or until the internal temperature reaches 165°F. If needed, broil for an additional 2-3 minutes to achieve a crispier exterior.
Once cooked, remove both from the oven. Let the chicken rest for 5 minutes before slicing.
Plate the sliced chicken breast alongside the crispy Brussels sprouts and enjoy your hearty, flavorful meal.