Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Pat the chicken thighs dry with a paper towel and cut them into 1.5-inch bite-sized pieces.
Chop the broccoli into small florets, slice the bell pepper into strips, and cut the zucchini into half-moons.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, oregano, thyme, salt, and pepper.
Place the chicken and vegetables on the prepared sheet pan and pour the lemon-herb dressing over them.
Toss everything thoroughly with your hands or tongs until evenly coated, then spread into a single layer.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the vegetables are tender and slightly charred.
Serve immediately, optionally garnished with a sprinkle of fresh parsley or an extra squeeze of lemon.