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. This 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.
How to Roast Onions
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 they are golden brown. Sprinkle with more fresh thyme and rosemary.
Recipe tips
- For optimum taste use sweet yellow onions or Vidalia onions. Slice the onions in half vertically from tip to root.
- Any number of fresh herbs will work with this recipe. We love using thyme, rosemary, Italian parsley, or whole cloves of garlic added to the baking sheet.
- Try dried herbs like oregano or sage. I find these herbs are better used dried as they complement the onions better and are not bitter like their fresh counterparts.
- Parchment paper helps the onions brown better and cook more evenly. It is usually rated up to 420 degrees Fahrenheit as long as you keep it away from any open flames. 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.
- Store leftovers in an airtight container in the fridge for up to 3 days.
What to serve with roasted onions
- Grilled Steak
- Air Fryer Salmon
- Mashed Potatoes
- Loaded French Fries
- Garlic Lemon Butter Seared Scallops
- Roasted Poultry
- Cheeseburgers
- Eggplant Parmesan
- Pork Tenderloin
More delicious onion recipes to try!
Roasted Onions
Ingredients
- 4 medium sweet 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
- For optimum taste use sweet yellow onions or Vidalia onions. Slice the onions in half vertically from tip to root.
- Any number of fresh herbs will work with this recipe. We love using thyme, rosemary, Italian parsley, or whole cloves of garlic added to the baking sheet.
- Try dried herbs like oregano or sage. I find these herbs are better used dried as they complement the onions better and are not bitter like their fresh counterparts.
- Parchment paper helps the onions brown better and cook more evenly. It is usually rated up to 420 degrees Fahrenheit as long as you keep it away from any open flames. 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.
- Store leftovers in an airtight container in the fridge for up to 3 days.
Nutrition
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Chikumo Fiseko
I will try to make this too! Good thing I was able to visit your blog. Pretty interesting recipe! Thank you for sharing. Hopefully, I can make this successfully.
Beth Pierce
I am sure you will do just fine. The recipe is fairly easy.
Mila R
OMG, this was great! They are delicious! My whole family loved them so much!
Kat
This dish was so easy to make and so tasty. Thank you for the recipe.
Irrena
If you have fresh herbs like rosemary it really does this recipe justicce! thanks for sharing
Beth Pierce
My please Irrena! I love fresh rosemary!
Rose Ann Sales
Wow! These were absolutely delicious and tasty! Such an easy recipe and they are a great side dish for so many things.
Neely Moldovan
Oh yum! I love roasted onions. Such a great thing to add to different meals!
Alita
Roasted onions are the best and an ultimate favorite at home. I make them repeatedly and the kids love them.
Gervin Khan
Wow! This onion dish was absolutely delicious. It was perfectly roasted and the texture was spot on. We had them with some grilled steak and we loved it.
Tweenselmom
Onions are my fave food toppings and roasted onions are the best. Thanks for sharing the recipe. It was easy and yummy!
Christine
Yum! I love onions. This is such a great side dish. The whole family really enjoyed it.
Tameka H
This will go perfectly with my roasted pork! Thanks for this!
Neely Moldovan
Oh I usually do roasted onions with other veggies but this sounds delish!
Ej Requina
A perfect side dish for steaks! Definitely be preparing this on my next family gathering I am sure this is going to be a hit!
Rosey
I’ve never roasted nor heard of someone roasting just an onion, but it sounds and looks fabulous. Pinning it for when I feel adventurous.
Ivan Carlo Jose
We love to make roasted onions at home. The caramelized edges taste lovely.
Claudia
I love that these simple oven-roasted onions are tender, mellow, and delicious. It doesn’t require so much peeling!
Ntensibe Edgar
You spoke of the pork tenderloin and I remembered a meal I had a few weeks ago! It was the roasted onion that made it so good.
Bryan
I do love onions. I know some people don’t like them at all, but I enjoy them. And the roasted version is often less hot and more palatable, sometimes making them acceptable to non- onion lovers.
Beth Pierce
Very true!
Krystle
I can’t believe I’ve never roasted onions before. These are such a treat
Stephanie
Such a simple but great recipe! I had made roasted vegetables before, but hadn’t thought of trying it with whole onions. My family loves sweet onions!
Christine
Yum! I happen to love onions so this looks so good. I can’t wait to try this recipe. Thank you!
Freya
These were so delicious served alongside a roast dinner, the roasting really sweetens the flavour so much!
Beth Pierce
Thanks Freya! So glad that you liked them!
Catalina
This will be my new favorite side dish. Onions are so good!
Michele
OMG! I can’t believe how good these sweet roasted onions tasted! I served them with a pot roast and got rave reviews! I’ll definitely be making these again.
Beth Pierce
Thanks Michele! They are so delicious with pot roast!
Toni
I love it! Such a perfect natural flavoring! Thanks so much for sharing!
Lauren
So deliciously sweet, we love them with roast chicken and some creamy mash.
Beth Pierce
Great choices! How delicious!
Amanda
These onions came out perfectly! They were so tender, and I love the extra flavor the rosemary and thyme added. Delicious and so simple!
Beth Pierce
So glad that you liked it Amanda!
Claudia Lamascolo
I had never roasted onions like this before until now and that made a fantastic flavor with that rosemary addition
Beth Pierce
Thanks Claudia! So glad that you liked it!!
Amanda
This is one of our favorite simple side dishes! So much flavor and so easy.
Erik
Wow this was so easy! Love the recommendation of serving it with burgers, too.
Beth Pierce
Thanks Erik!
Amanda
Oh my goodness I can only imagine how good this smells!