Start by preheating your oven to 425°F (220°C). While it heats up, line a large sheet pan with foil to prevent sticking and make cleanup faster. In a mixing bowl, whisk together the olive oil, lemon juice, vinegar, garlic, oregano, paprika, salt, and pepper. This vibrant marinade is the foundation of the flavor.
Add the chicken thighs to the marinade and toss them well so that every piece is coated. Let them sit and soak up the flavors for 10 to 15 minutes. This quick marination ensures the chicken is juicy and tasty throughout, even with a short cooking time.
While the chicken marinates, prep your vegetables. Cut the baby potatoes in half, slice the red onion and bell pepper, and keep the cherry tomatoes and lemon ready. These veggies will roast alongside the chicken, absorbing all the savory juices.
On the prepared sheet pan, scatter the halved baby potatoes, bell pepper slices, and red onion wedges. Pour half of the marinade over these vegetables and toss them around to coat them evenly. This not only adds flavor but helps them roast nicely.
Now place the marinated chicken thighs in between the vegetables on the sheet pan. Make sure they aren’t overlapping to ensure even cooking. Tuck in thin slices of lemon on top of the chicken and veggies—these will caramelize slightly and add a citrusy punch.
Once arranged, place the tray in the oven and roast for 30 to 40 minutes. The chicken should reach an internal temperature of 165°F (74°C), and the potatoes should be fork-tender with golden edges. Roasting everything together means the flavors mingle perfectly.
When the chicken is cooked and the veggies are nicely roasted, take the sheet pan out of the oven. Sprinkle the Kalamata olives and crumbled feta over the top. Return the tray to the oven for just 5 minutes. This softens the feta slightly and warms the olives, enhancing their flavor.
Remove from the oven and let the dish rest for a couple of minutes. Sprinkle chopped fresh parsley generously over the top for a burst of color and freshness. Serve the chicken and vegetables hot with a side of tzatziki if you like. The whole dish is hearty, flavorful, and low-stress.