Layered with lemon vinaigrette, herbs, vegetables, and tzatziki, this sheet-pan chicken recipe turns a simple supper into a restaurant-style Greek feast.
Adjust oven rack to lowest position and preheat oven to 475°F (245°C). In a small bowl, whisk together lemon juice, red wine vinegar, thyme, dried oregano, black pepper, coriander, 6 tablespoons olive oil, 2 teaspoons salt, and 1 1/2 teaspoons grated garlic. In a large bowl, toss chicken and 6 tablespoons prepared lemon vinaigrette until evenly coated, and set aside at room temperature for 30 minutes; set aside remaining lemon vinaigrette (about 3 tablespoons).
Step 2
While chicken marinates, squeeze excess moisture from cucumber with a clean kitchen towel set over the sink or a bowl.
Step 3
Transfer dried cucumber to a medium bowl and stir in yogurt, fresh mint and/or dill, remaining 2 tablespoons olive oil, 1/2 teaspoon salt, and remaining garlic. Cover and refrigerate tzatziki until ready to serve.
Step 4
On a rimmed baking sheet, arrange chicken thighs, skin-side up, in center of sheet, leaving edges of sheet empty; do not wash bowl. Toss onion with 1 tablespoon of lemon vinaigrette in reserved bowl until evenly coated, and arrange evenly around chicken; do not wash bowl. Roast until chicken and onion are starting to brown, 15 to 18 minutes.
Step 5
Meanwhile, toss broccolini with 1/2 tablespoon of prepared lemon vinaigrette in reserved bowl. Working quickly, remove sheet pan from oven and place broccolini around chicken over onion slices; do not wash empty bowl. Return to oven, and roast until broccolini is starting to brown and soften, 8 to 10 minutes.
Step 6
Meanwhile, toss tomatoes, olives, and 1/2 tablespoon of lemon vinaigrette in reserved bowl; sprinkle tomato mixture and feta evenly around chicken with other vegetables. Roast until tomatoes are softened and feta is beginning to brown, and chicken registers anywhere from 175 to 195℉ (80 to 90°C) , 8 to 10 minutes.
Step 7
To serve, spread reserved tzatziki evenly on 4 plates; top with roasted chicken and vegetable mixture, reserving as much drippings as possible on pan. Using a spatula, scrape any accumulated juices from sheet into remaining lemon vinaigrette and drizzle evenly over the chicken and vegetable mixture. Garnish with chopped fresh tender herbs.