Whole Roasted Onions Recipe (2024)

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By Courtney ODell

4.47 from 15 votes

Apr 28, 2022, Updated Mar 23, 2024

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Whole Roasted Onions Recipe – delicious buttery whole roasted onions baked to perfection – perfect as a side dish!

Whole Roasted Onions Recipe (2)

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Table of contents

  • Buttery Whole Onions
  • How To Roast Whole Onions
  • Tips and Tricks to Perfect Whole Roasted Onions
  • Recipe FAQs
  • Other Easy Side Dishes You’ll Love
  • Whole Roasted Onions Recipe
Whole Roasted Onions Recipe (3)

Buttery Whole Onions

This is the perfect gorgeous – but crazy easy – side dish for a holiday dinner or even Sunday supper – and it makes the whole house smell amazing.

These onions roast to soft, buttery perfection with just a couple herbs and spices – and are fabulous paired with pork tenderloin, steaks, turkey, chicken thighs, or any hearty main dish you love!

We hope you love this recipe as much as we do!

How To Roast Whole Onions

Roasting onions is so easy, you’re going to want to make these decadent, buttery onions for every meal!

If you can use a knife and sprinkle some herbs, you can make this side dish!

The process is relatively straightforward, following these steps:

  • Cut off the top and bottoms to onions
  • Season generously with salt and pepper
  • Top with butter and herbs
  • Bake

Tips and Tricks to Perfect Whole Roasted Onions

Baked onions are done when they are browned and very soft, which can take anywhere from 60-100 minutes.

Don’t rush your onions – make them ahead of time and reheat if you’re worried about timing for an event, as the flavor really can’t be rushed for this recipe.

Recipe FAQs

When are whole roasted onions done?

Baked onions are done when they are browned and very soft, which can take anywhere from 60-100 minutes.
Don’t rush your onions – make them ahead of time and reheat if you’re worried about timing for an event, as the flavor really can’t be rushed for this recipe.

Do you roast onion in the skin?

We roast onion in the skin for the best flavor – simply discard when serving.

Are whole roasted onions vegan?

This recipe isn’t expressly vegan, as we’re using butter.
Swap the butter for equal amounts of olive oil drizzled over the onions to make it vegan!

How long can whole roasted onions be kept?

This recipe can be stored in the refrigerator in an airtight container for up to five days.

Whole Roasted Onions Recipe (7)

Other Easy Side Dishes You’ll Love

If you’re looking for other dishes to pair alongside a pork tenderloin, London broil, turkey breast, lobster tails, or even cauliflower steaks – please check out some of our favorite side dishes below:

You can find our entire side dish recipe index here.

Whole Roasted Onions Recipe (8)

Whole Roasted Onions Recipe

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Whole Roasted Onions Recipe (10)

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Whole Roasted Onions Recipe

Whole Roasted Onions Recipe – delicious buttery whole roasted onions baked to perfection – perfect as a side dish for pork, chicken, & steak!

Course Side dishes

Cuisine American

Keyword onions, side dish, vegetables

Prep Time 5 minutes minutes

Cook Time 1 hour hour 10 minutes minutes

Total Time 1 hour hour 15 minutes minutes

Servings 6

Calories 151kcal

Author Courtney O’Dell

Ingredients

  • 6 yellow onions
  • 6 tablespoons butter cut into 6 pats for each onion (use olive oil for vegan)
  • 1 tsp italian herb seasonings
  • 2-3 sprigs fresh rosemary or thyme
  • salt and pepper to taste

Instructions

  • Preheat oven to 350 degrees.

  • Cut the top and bottom off onion to make a flat surface, leaving peel on.

  • Place into baking dish, either lined with foil or prepped with nonstick cooking spray.

  • Sprinkle with salt, pepper, and herbs.

  • Top with a pat of butter.

  • Bake 60-90 minutes at 350 degrees, until onions are browned, very soft, and fragrant.

  • When serving, remove peel.

Nutrition

Serving: 1g | Calories: 151kcal | Carbohydrates: 11g | Protein: 2g | Fat: 12g | Saturated Fat: 7g | Polyunsaturated Fat: 4g | Cholesterol: 31mg | Sodium: 144mg | Fiber: 2g | Sugar: 5g

Categorized as:
gluten free, One Pot, Recipes, Side Dishes, Vegetables

About Courtney

Courtney loves to share great wine, good food, and loves to explore far flung places- all while masting an everyday elegant and easy style at lifestyle blog Sweet C’s Designs. Sweet C's devoted to finding the best food and drinks you'll want to make or find, around the world!

Read More About Me

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Whole Roasted Onions Recipe (2024)

FAQs

What kind of onion is best for roasting? ›

We recommend using yellow or red, because they hold up well during the roast. How do you cut an onion for roasting? We trim and peel the onions, and cut them into wedges for this preparation.

Are roasted onions good for you? ›

Onions offer many benefits for your health, including reducing risk for cancer and heart disease. They also have fiber which can help with digestion. This is a great way to use any extra onions you may have.

What is the best onion to eat whole? ›

While their color is similar to the yellow onion, white onions have a thinner, more-papery skin. They are also known for their consistently milder flavor, making them a better choice for serving raw.

Are red or white onions better for roasting? ›

What are the best uses for yellow, white, and red onions? Yellow for soups, stews, meat roasts. White for stir frying. Red for salads, sandwiches, guacamole.

Is white onion good for roasting? ›

Roasted White Onion

After having cleaned them and kept them in water for about an hour, so that the extreme flavor and smell are released, just cut them in a cross on the bottom and put them in a deep baking tray. Then season the onions with salt and pepper and cover them with oil and above all breadcrumbs.

How to roast onion without oil? ›

Here's how:
  1. Slice your onions into thin ½ rings.
  2. Cook on high heat with a ¼ a cup of water.
  3. Let water cook-off, and let onions brown and stick to the pan.
  4. Add a few tablespoons of water, to deglaze the pan and keep the onions from burning. ...
  5. Repeat steps 3 and 4 until onions are soft and deep brown.

Can you caramelize onions in oven? ›

Preheat the oven to 350F. Place sliced onions in a 9x13-inch casserole dish. Add olive oil, salt and pepper, and toss to combine. Cover the pan with foil and bake for 1 hour.

Which organ benefits most from eating onions? ›

The heart is one of the primary beneficiaries due to the antioxidant flavonoids in onions, which can help reduce heart disease risk by lowering blood pressure and cholesterol levels. The digestive system also benefits from onions as they promote healthy gut bacteria.

What does eating a whole onion do to your body? ›

Onions are rich in antioxidants like quercetin, which assist in decreasing bad cholesterol levels in the body, leading to improved cardiovascular health. Consumption of raw onion also aids in enhancing blood circulation, reducing high blood pressure, and preventing the risk of heart disease.

Is it OK to eat a whole onion everyday? ›

While onions offer many health benefits, consuming an excess amount can lead to gastrointestinal distress, such as irritable bowel syndrome and acid reflux. Although onions are quite safe to consume, rarely they may harm your health if you have any underlying health conditions or when you consume them in excess.

What does eating 2 onions a day do? ›

Onions contain antioxidants and compounds that may reduce your risk of heart disease by fighting inflammation and lowering triglyceride and cholesterol levels. They contain a large amount of quercetin, a flavonoid antioxidant and anti-inflammatory that may help lower high blood pressure .

Can eating too many onions hurt your stomach? ›

Onions are hard to digest largely because they contain fructans, which are not absorbed well in the small intestine. In fact, as fructans ferment, they can cause a great deal of digestive distress in the form of bloating, gas and diarrhea.

What is a meal that has too much onion called? ›

Some people refer to too much onion being oniony, which is not true. Instead, too much onion is said to be sulfury.

Is yellow or white onion better for roasting? ›

Yellow onions are your go-to cooking onions. This onion has yellow skin and a strong flavor due to its high sulphur content, which mellows out during cooking, becoming sweet and flavorful. Its ability to hold up to heat makes it great for caramelizing and roasting.

Are yellow or white onions better for roasting? ›

"If you ever have a recipe that calls for [cooking] onions, the yellow onion is your best bet," says Duane Hendershot, general manager of Healthy Living Market in Saratoga Springs, New York. White onions are slightly milder in flavor than yellow onions, and taste a bit more sweet.

What is the best onion to cook meat with? ›

Yellow Onions

This is one of the best onions to use when cooking almost anything. Use them when making meat dishes (roasted chicken, pot roast, rack of lamb etc.) or as a base for many sauces, stews and soups. Yellow onions are also higher in vitamin C as compared to other onion varieties.

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