Preheat oven to 400°F (200°C) and line a baking sheet or roasting pan.
Place chicken breasts in the center of the pan.
Arrange broccoli, carrots, and bell peppers around the chicken.
In a bowl mix olive oil, lemon juice, lemon zest, garlic, oregano, thyme, salt, and pepper.
Drizzle the lemon herb mixture evenly over the chicken and vegetables.
Toss vegetables lightly to coat them in the seasoning.
Roast in the oven for 25–30 minutes until the chicken is cooked through and vegetables are tender.
Remove from oven and let rest for 5 minutes before serving.