Preheat the oven: Set to 425°F (220°C).
Line a large sheet pan with parchment paper or lightly oil it for easier cleanup.
Make the marinade: In a bowl, combine olive oil, lemon zest, lemon juice, garlic, oregano, thyme or rosemary (if using), smoked paprika, salt, and pepper. Stir well.
Season the chicken: Add the chicken to the bowl and toss to coat. Let it sit while you prep the vegetables.
Even 10 minutes makes a difference.
Prep the vegetables: Halve the potatoes, wedge the red onion, and slice the peppers. Keep pieces similar in size for even roasting.
Toss the vegetables: On the sheet pan, toss potatoes, onion, and peppers with a drizzle of olive oil, a pinch of salt and pepper, and 1 teaspoon oregano. Spread into a single layer.
Add the chicken: Nestle the marinated chicken among the vegetables.
Pour any extra marinade over the top.
Roast, round one: Bake for 20 minutes.
Add tomatoes and olives: Remove the pan, scatter cherry tomatoes and olives, then return to the oven.
Roast, round two: Bake another 10 to 15 minutes, until the chicken reaches 165°F (74°C) and the potatoes are tender and golden.
Finish with feta and herbs: Sprinkle crumbled feta and chopped parsley or dill over the hot pan. Squeeze a little extra lemon if you like brightness.
Serve: Enjoy as is or with warm pita, rice, or orzo. A dollop of tzatziki is a great touch.