Roasted Onions - Small Town Woman

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These easy roasted onions combine sweet onions with olive oil, butter, kosher salt, fresh ground black pepper, and fresh thyme and rosemary into a flavor-packed aromatic side dish. It is a must-try for all onion lovers and a regular roasted veggie at our house.

Roasted onions on a baking sheet covered with parchment paper.

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 serving this side with grilled steak and roasted chicken, but endless possibilities exist.

Ingredient Notes and Substitutions

See the complete list of ingredients on the recipe card below.

Onions: preferably sweet yellow onions or Vidalia onions.
Seasonings: salt and freshly ground black pepper
Herbs: fresh rosemary, thyme, parsley

How to Roast Onions

This is just the nutshell version. See the recipe card below for complete directions.

Cut the onions in half from the tip to the 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.
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.

Halved onions with butter and herbs on a parchment covered baking sheet.

Preparation 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 a bonus, it makes cleanup easy.
These sweet treats are best served promptly, but can easily be heated again in the hot oven for about 5 minutes.

Roasted onions with fresh herbs and olive oil.

Serving Suggestions

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 Onion Recipes

Air Fryer Onion Rings
French Onion Dip
Blooming Onion
Sautéed Mushrooms and Onions
French Onion Soup
Onion Gravy
French Onion Chicken

Roasted Onions

With just five simple pantry ingredients and two fresh herbs these easy sweet caramelized Roasted Onions make the most aromatic and flavorful side dish. 5 from 36 votes Print Pin Rate Course: Side DishCuisine: American Prep Time: 5 minutes Cook Time: 45 minutes Servings: 4 servings Calories: 249kcal Author: Beth Pierce

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 for 40-45 minutes or until golden brown and tender. Sprinkle with more fresh thyme and rosemary. For best results, serve promptly.