Air fryer roasted onions are a simple, budget-friendly, and surprisingly flavorful side dish. With just a few ingredients and a quick cook time, the onions become soft, sweet, and slightly caramelized on top — perfect to accompany many dishes.
The air fryer gives well-cooked, golden onions without turning on the oven and using very little oil. The secret of this recipe is adding a pinch of sugar, which helps the onions’ natural sweetness to shine during cooking.
They are ideal as a side for meat, chicken, fish, or burgers, but also to enrich bruschetta, sandwiches, or rustic plates. A very easy recipe that always wins everyone over at the table.
- Difficulty: Very easy
- Cost: Budget-friendly
- Preparation time: 5 Minutes
- Portions: 4 servings
- Cooking methods: Air frying
- Cuisine: Italian
- Seasonality: All seasons
Ingredients for soft, caramelized roasted onions in the air fryer
- 4 onions
- 2 tbsp extra virgin olive oil
- 1 tsp salt
- 1/4 tsp black pepper
- 2 tsp dried oregano
- 1 tsp sugar
Tools for soft, caramelized roasted onions in the air fryer
- 1 Air fryer
Steps for soft, caramelized roasted onions in the air fryer
Peel the onions, trim the ends and
cut them in half across the width.
Place the onion halves on a cutting board with the cut side facing up and evenly sprinkle salt, pepper, oregano, and sugar over them.
Transfer the onions to the air fryer basket and
dress them with extra virgin olive oil, pouring it over each half.
Cook at 356°F (about 180°C) for approximately 18–22 minutes, until the onions are soft inside and slightly caramelized on top.
If you want a deeper browning, you can increase the temperature to 374°F (about 190°C) for the last 3–4 minutes of cooking.
Serve the roasted onions hot, straight away.
How to store roasted onions:
Air fryer roasted onions keep in the refrigerator for 2 days in an airtight container.
To reheat them, simply put them back in the air fryer for 3–4 minutes at 356°F (about 180°C).
Freezing is not recommended because the onions would lose their texture.
Tips:
For this recipe you can use white, yellow, or red onions. Red onions are slightly sweeter.
If you want even more intense caramelization, you can lightly score the surface of the onions with a knife before seasoning them.
For a richer flavor, you can also add thyme, rosemary, or a pinch of sweet paprika.
FAQ (Questions & Answers)
Can I make roasted onions without sugar?
Yes, the sugar only helps with caramelization, but you can omit it.
Can I bake the onions in the oven?
Yes, you can bake them in a conventional oven at 392°F (about 200°C) for around 30 minutes.
Do the onions need to be turned during cooking?
No, it’s not necessary. Cooking with the cut side facing up allows them to brown perfectly.
