Baked Onion

Baked onions are a super simple side dish but gourmet enough to serve at a dinner party. 

lightly golden baked onion on white plate with sprig of basil

The flavor of this side dish is reminiscent of French Onion Soup. And the presentation can’t be beat. Our instructions are for one onion, but you can easily bake up to six onions on the same baking sheet for an impressive dinner party spread.

What kind of onions are best for baking?

Sweet onions are the best kind to bake and use as a side dish. They have a milder somewhat sweet flavor that only gets sweeter with baking. Red onions are another great option. 

How do you prepare an onion for baking whole?

You’re in luck! We’re showing you step by step exactly how to properly prepare an onion for baking. You’ll bake it with seasonings so once it comes out of the oven it’s perfectly cooked and seasoned to enjoy immediately. So gather your knife, cutting board, and onions and let’s get cooking!

Step #1

First, preheat your oven to 350°F. Peel your onion, leaving the root intact. If your onion sits level, you can leave it alone. If not, cut a thin slice off the root to create a flat bottom.

Peeled Vidalia Onion

Step #2

Use a paring knife to cut a 1-inch deep cone into the top of the onion.

Cut Vidalia Onion

Step #3

Insert a vegetable, chicken, or beef bouillon cube into the hole.

Fill with Bouillon

Step #4

Fill the rest of the hole with butter, about  1-2 tablespoons. Season with salt and pepper.

Add Butter

Step #5

We’re going to bake the whole onion in foil so place the filled onion on a sheet of foil large enough to encase it. Wrap the onion in foil, bringing the edges up in the center.

Vidalia Onions with Butter

Step #6

Twist the foil together to seal the onion in. Place the foil-wrapped onion on a baking sheet.

Vidalia with Foil

Step #7

Bake for 45-60 minutes, until the onion is tender. Serve warm.

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Baked Onion

Baked Vidalia Onions

Baked onions are such a simple side dish but gourmet enough to serve at a dinner party.

  • Author: Christine Pittman
  • Prep Time: 5 minutes
  • Cook Time: 45 minutes
  • Total Time: 50 minutes
  • Yield: 1 serving

Ingredients

  • 1 medium onion
  • 1 vegetable, chicken or beef bouillon cube
  • 12 Tbsp. butter

Instructions

  1. Preheat the oven to 350°F.
  2. Peel the onion, leaving the root intact. If the onion sits level, it’s ready to use. If not, cut a thin slice off the root to create a flat bottom.
  3. Use a paring knife to cut a 1 inch deep cone into the top of the onion.
  4. Insert a vegetable, chicken, or beef bouillon cube into the hole.
  5. Fill the rest of the hole with butter, about 1-2 tablespoons. Season with salt and pepper.
  6. Place the filled onion on a sheet of foil large enough to encase it.
  7. Wrap the onion in foil, bringing the edges up in the center. Twist the foil together to seal the onion in. Place the foil-wrapped onion on a baking sheet.
  8. Bake for 45-60 minutes, until the onion is tender. Serve warm.

Video by Leigh Olson.

Baked Onion
Baked Onion

Christine Pittman

Christine is the Senior Editor and Owner of The Cookful, COOKtheSTORY and IsThisThatFood. Her sites reach over 1.5 million readers per month, which means that things can get a bit crazy. She's constantly writing, taking pictures, editing, managing contributors, and, oh yeah, cooking. To say that she wears many hats is an understatement - there are many hats, and also many shirts, shoes, pants, and even the odd cape!