Preheat the oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Prepare the chicken marinade: In a bowl, whisk together olive oil, lemon juice, lemon zest, minced garlic, thyme, rosemary, salt, and pepper.
Marinate the chicken: Place the chicken thighs in a ziplock bag or a large bowl, pour the marinade over them, and ensure they are well coated. Let it marinate for at least 30 minutes (or up to 2 hours in the fridge for more flavor).
Prepare the vegetables: In a separate bowl, toss the sliced zucchinis, chopped bell pepper, and onion wedges with a drizzle of olive oil, salt, and pepper.
Arrange the ingredients: On the prepared baking sheet, place the marinated chicken thighs in the center and arrange the vegetables around them in a single layer.
Roast in the oven: Bake for 35-40 minutes or until the chicken skin is crispy, and the internal temperature reaches 165°F (75°C). The vegetables should become tender and slightly caramelized.
Garnish and serve: Once done, remove from the oven, sprinkle freshly chopped parsley on top, and let it rest for a few minutes before serving. Enjoy your delicious sheet pan meal!
Notes
For more flavor, marinate the chicken for up to 2 hours.