This easy Roasted Onions Recipe combines sweet onions with olive oil, butter, kosher salt, fresh ground black pepper, and fresh thyme and rosemary into a flavor-packed roasted aromatic side dish. It is a must-try for all onion lovers and a regular roasted veggie at our house.
With just a handful of simple ingredients and a few minutes of preparation, this tasty vegetable recipe is a must-have for every good cook. I love to serve this side with grilled steaks and roasted chicken, but the possibilities are simply endless.
Table of contents
Key Ingredients for Roasted Onions
Please see the recipe card below for the full ingredient list and quantities.
- Onions: preferably sweet yellow onions or Vidalia onions.
- Seasonings and herbs: salt, freshly ground black pepper, fresh rosemary and thyme.
How to Roast Onions
This is just the nutshell version. See the recipe card below for full directions.
Simply cut the onions in half from tip to root, then remove the outer dried layers. Arrange them in a single layer cut side up on a rimmed baking sheet covered with parchment paper. Then drizzle with olive oil and top each half with a pat of butter.
Sprinkle generously with kosher salt and fresh ground black pepper. Top with fresh thyme leaves and chopped fresh rosemary. Roast for 35-45 minutes or until golden brown. Sprinkle with more fresh thyme and rosemary.
Beth’s Recipe Tips
- This recipe works with any number of fresh herbs. We love adding thyme, rosemary, Italian parsley, or whole cloves of garlic to the baking sheet.
- Parchment paper helps the onions brown better and cook more evenly. It is usually rated up to 420 degrees Fahrenheit, but check your box As an added bonus, it makes for easy clean-up.
- These sweet treats are best served promptly, but they can easily be heated again in the hot oven for about 5 minutes.
What to Serve with Roasted Onions
I like to serve these onions with New York strip steak, air fryer salmon, or beef roast. For something different, try a big bowl of hearty soup like minestrone or meatball soup.
More Delicious Onion Recipes
Roasted Onions
Ingredients
- 4 medium sweet yellow onions sliced in half from root to tip
- 3 tablespoons olive oil
- 2 tablespoons butter
- kosher salt
- fresh ground black pepper
- fresh rosemary chopped
- fresh thyme leaves
Instructions
- Preheat the oven to 400 degrees. Cover a small baking sheet with parchment paper.
- Cut the onions in half from tip to root then remove the outer dried layers. Lay them cut side up on the prepared baking sheet in a single layer.
- Drizzle with olive oil and top each half with a pat of butter. Sprinkle generously with kosher salt and fresh ground black pepper. Top with fresh thyme leaves and chopped fresh rosemary.
- Roast 40-45 minutes or until golden brown and tender. Sprinkle with more fresh thyme and rosemary. For best results serve promptly.
Notes
- These sweet treats are best served promptly, but they can easily be heated again in a 400-degree oven for about 5 minutes.
- Store leftovers in an airtight container in the fridge for up to 3 days.
Nutrition
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Tayler
I made these onions as a side with dinner last night and they were delicious! Already can’t wait to make them again!
Holley
Sooooo delicious! I love these onions with my steak bites!
Justine
I don’t often think of onions as being a dish on their own, but they’re really great – and this is a fantastic way to showcase them!
Beth Pierce
Thank you, Justine!
paula
Loved this roasted onion recipe. It went great with dinner last night!