Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
In a small mixing bowl, whisk together half of the olive oil, minced garlic, chopped rosemary, thyme, and lemon juice.
Place the chicken breast in a shallow dish, coat thoroughly with the herb marinade, and allow it to rest for 15 minutes.
Prepare the vegetables by halving the Brussels sprouts, slicing the bell pepper, and dicing the zucchini.
Toss the vegetables with the remaining olive oil, sea salt, and black pepper directly on the baking sheet.
Roast the vegetables in the oven for 20-25 minutes until they are tender and show golden caramelized edges.
While the vegetables roast, heat a non-stick skillet over medium-high heat and sear the chicken for 6-7 minutes per side until fully cooked.
Slice the herb-crusted chicken and serve it warm alongside the roasted vegetable medley.