Preheat the oven to 400°F (200°C).
Place the broccoli, carrots, bell pepper, and onion on a large baking sheet.
Drizzle with olive oil, season with salt and pepper, and toss to coat evenly.
Roast for 30–35 minutes, stirring halfway, until tender and lightly browned.
Preheat the oven to 400°F (200°C).
Place the broccoli, carrots, bell pepper, and onion on a large baking sheet.
Drizzle with olive oil, season with salt and pepper, and toss to coat evenly.
Roast for 30–35 minutes, stirring halfway, until tender and lightly browned.
Heat a large skillet over medium heat.
Add the marinated chicken and cook for 6–7 minutes per side, until golden and fully cooked (internal temperature 165°F / 74°C).
Remove from heat and let rest for 5 minutes.
Serve the chicken alongside the roasted vegetables.
Spoon any remaining lemon-garlic juices from the pan over the chicken for extra flavor.