Preheat the oven to 425°F.
Rinse and pat dry the chicken breast. Season both sides with salt, pepper, dried thyme, and rosemary.
Heat half the olive oil in a skillet over medium-high heat. Sear the chicken breast for 2-3 minutes on each side until a golden herb crust forms.
While the chicken is searing, chop the red bell pepper, zucchini, and red onion into bite-sized pieces and mince the garlic.
Place the chopped vegetables and garlic in a bowl, drizzle with the remaining olive oil, add a pinch of salt and pepper, and toss to coat evenly.
Spread the vegetables on a baking sheet in a single layer. Roast in the preheated oven for 15-20 minutes, stirring halfway through, until they are tender and slightly charred.
Return the seared chicken to the skillet (or transfer both to an oven-safe dish) and finish cooking in the oven for an additional 8-10 minutes, or until the chicken reaches an internal temperature of 165°F.
Plate the chicken breast alongside a generous serving of roasted vegetables. Serve warm and enjoy a flavorful, nutrient-packed meal.