Preheat the oven to 425°F (220°C). Line a large baking sheet with parchment paper or foil for easier cleanup.
In a small bowl, whisk together olive oil, lemon or lime juice, garlic, oregano, thyme, paprika, Dijon mustard, salt, and pepper.
¼ cup extra-virgin olive oil, 1 lemon or lime juice, 6 garlic cloves, 2 teaspoons dried oregano, 1 teaspoon dried thyme, ½ teaspoon paprika, 1 teaspoon Dijon mustard, Salt and black pepper
Cut the chicken breasts into large chunks (about 3 to 4 inches). Place them in a bowl and pour in about two-thirds of the marinade. Toss well to coat and let sit for 15 minutes.
4 chicken breasts
Spread the zucchini, red onion, and cherry tomatoes on the prepared baking sheet. Drizzle with the remaining marinade and toss to evenly coat.
1 medium zucchini, 1 red onion, 2 cups cherry tomatoes
Nestle the marinated chicken pieces among the vegetables on the sheet pan. Bake for 35 minutes, or until the chicken is almost cooked through and the vegetables start to soften.
Remove the pan from the oven. Scatter the Kalamata olives and crumbled feta over the top. Return to the oven for an additional 5–10 minutes, or until the chicken is fully cooked and the vegetables are tender.
½ cup pitted Kalamata olives, ¼ cup crumbled feta cheese
Garnish with fresh chopped parsley. Serve warm with pita bread, rice, or a side of tzatziki, if desired.
Fresh parsley