Step 1: Prepare the Chicken Marinade: In a medium bowl, combine 2 tablespoons olive oil, lemon zest, lemon juice, minced garlic, fresh rosemary, fresh thyme, dried oregano, 1/2 teaspoon salt, and 1/4 teaspoon black pepper. Whisk well to combine.
Step 2: Marinate the Chicken: Add the chicken breasts or thighs to the marinade, ensuring they are fully coated. Cover the bowl and refrigerate for at least 30 minutes, or up to 4 hours for maximum flavor. While the chicken marinates, proceed to prepare the vegetables.
Step 3: Prepare the Vegetables: In a large bowl, combine the cut zucchini, red bell pepper, yellow bell pepper, cherry tomatoes, and red onion. Drizzle with 1-2 tablespoons of olive oil, a pinch of salt, and a pinch of black pepper. Toss gently to coat evenly.
Step 4: Preheat Grill or Oven: If grilling, preheat your grill to medium-high heat (about 400-450°F / 200-230°C). If roasting, preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Step 5: Cook the Chicken: For grilling: Place the marinated chicken on the preheated grill. Cook for 6-8 minutes per side, or until internal temperature reaches 165°F (74°C). For roasting: Place chicken on one side of the prepared baking sheet. Roast for 20-25 minutes, or until internal temperature reaches 165°F (74°C).
Step 6: Cook the Vegetables: For grilling: Place the seasoned vegetables in a grill basket or directly on the grill grates. Grill for 10-15 minutes, tossing occasionally, until tender-crisp and slightly charred. For roasting: Spread the seasoned vegetables on the other side of the baking sheet (if using one sheet) or on a separate baking sheet. Roast for 15-20 minutes, or until tender and lightly caramelized. If the chicken is roasting, you can often roast the vegetables at the same time.
Step 7: Rest and Serve: Once cooked, remove the chicken from the grill or oven and let it rest for 5 minutes before slicing (if desired). This helps keep the chicken juicy. Arrange the sliced chicken and roasted vegetables on plates. Garnish with fresh parsley or basil, if using. Serve immediately and enjoy one of the most satisfying summer dinner recipes for family!