In a large mixing bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, chopped rosemary, chopped thyme, salt, and black pepper to create the marinade.
Add the bone-in chicken thighs to the bowl and toss thoroughly to coat all sides with the marinade. Let them sit while you prep the vegetables.
Slice the red bell pepper and zucchini into thin strips, and cut the red onion into wedges. Add these vegetables to the marinade bowl along with the cherry tomatoes. Toss gently to coat evenly.
Spread the marinated chicken thighs on the sheet pan in a single layer, skin side up. Arrange the vegetables around the chicken, ensuring space between pieces for even roasting.
Place the sheet pan in the preheated oven at 425°F (220°C) and roast for 35-40 minutes until the chicken reaches an internal temperature of 165°F (74°C) and the skin is golden and crispy. Vegetables should be tender and caramelized.
Remove from the oven and let rest for a few minutes before serving. Enjoy your flavorful Sheet Pan Lemon Herb Chicken & Veg!