Preheat the oven: Set it to 425°F (220°C). Line a large sheet pan with parchment paper for easy cleanup.
Make the marinade: In a bowl, whisk olive oil, lemon zest, lemon juice, garlic, herbs, salt, pepper, and any optional spices.
It should smell bright and garlicky.
Prep the chicken: Pat chicken dry with paper towels. If using breasts, cut into equal-sized chunks or pound to even thickness for consistent cooking.
Toss everything: Add chicken and vegetables to a large bowl. Pour the marinade over and toss until well coated.
Let it sit for 10–15 minutes if you have time.
Arrange on the pan: Spread in a single layer. Keep some space between pieces so they roast, not steam. Place tomatoes near the edges to blister nicely.
Roast: Bake for 20–25 minutes, stirring once halfway.
Chicken should reach an internal temperature of 165°F (74°C) and veggies should be tender with caramelized edges.
Optional broil: For extra color, broil on high for 2–3 minutes. Watch closely to avoid burning.
Finish and serve: Squeeze more lemon over the top, sprinkle fresh parsley, and add a pinch of salt to brighten flavors. Serve as is, or over rice, quinoa, or couscous.