Onions roasted until caramelized and tender in a baking dish are a sweet Italian side. This vegetarian mediterranean dish is healthy, fresh, and a perfect accompaniment to family dinners.
Preheat your oven to 400°F (200°C) and set a rack in the middle position for even roasting.
Peel, halve, and slice the onions into ½-inch thick wedges, ensuring wedges stay intact for texture.
Drizzle olive oil in a 2–3 quart baking dish; layer onion wedges evenly without overcrowding.
Sprinkle onions with kosher salt, black pepper, and dried oregano, then toss gently to coat every piece.
Cover the dish tightly with foil and bake for 25 minutes to soften the onions while retaining moisture.
Remove foil, increase oven heat to 425°F, and continue roasting for 20–25 minutes, stirring gently halfway to caramelize all sides.
Remove from oven when onions are deeply golden and tender; scatter chopped fresh parsley over the top before serving.