Thick Caramelized Onion Slices (Printable Format)
Thick onion slices roasted until tender and caramelized, ideal for savory sides or appetizers.
# What You Need:
→ Vegetables
01 - 2 large yellow onions
→ Seasonings
02 - 2 tablespoons olive oil
03 - 1 teaspoon sea salt
04 - 0.5 teaspoon freshly ground black pepper
05 - 0.5 teaspoon dried thyme (optional)
→ Garnish (optional)
06 - 1 tablespoon chopped fresh parsley
# How-To Steps:
01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Peel the onions and slice them into 0.5-inch thick rounds, keeping the rings intact.
03 - Place the onion slices flat on the lined baking sheet.
04 - Drizzle olive oil evenly over each slice, then sprinkle with sea salt, black pepper, and dried thyme if using.
05 - Roast in the oven for 30 to 35 minutes, flipping once halfway through, until the onions turn golden brown and become tender.
06 - Transfer the roasted onions to a serving dish and garnish with chopped fresh parsley if desired. Serve warm.
# Expert Suggestions:
01 -
- Onions transform into something entirely different when roasted—sweet, tender, almost buttery without any butter
- Takes just 10 minutes of actual work and the oven does the rest while you relax
- Works as a side dish, appetizer, burger topping, or salad addition—one recipe, endless possibilities
02 -
- Flipping halfway is not optional—it's what ensures even caramelization on both sides. Without it, you'll get one side golden and the other pale.
- If you want even deeper caramelization, broil them for 2–3 minutes at the end. This takes them from great to restaurant-quality, though watch carefully so they don't burn.
03 -
- Keep them in an airtight container in the fridge—they're nearly as good cold the next day, wonderful on cheese boards or in grain bowls
- For restaurant-quality presentation, arrange them standing slightly overlapped on the platter right before serving