Kalyn's Kitchen

Roasted Vidalia Onion Rings with Parmesan

Roasted Vidalia Onion Rings with Parmesan are a delicious side dish idea for people who like sweet onions, and this is super easy to make! 

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Marinated and Roasted Vidalia Onion Rings with Parmesan found on KalynsKitchen.com

There’s nothing I love more than an ultra-easy recipe that produces a truly memorable dish, and this recipe for Roasted Vidalia Onion Rings with Parmesan is definitely one of those. I recently bought a big bag of Vidalia onions as part of a fundraiser, so I’ve been thinking of ways to use them.

After I marinated some onions for the Greek Salad with Marinated Onions and Oregano, I had the idea of marinating and then roasting the onions. If you’re a fan of caramelized onions, this dish has that same umami-laden flavor. Next time you’re cooking something in the oven, try roasting some marinated sweet onions for a delicious side dish.

What are Vidalia Onions?

Vidalia onions come from Vidalia, Georgia, where the low sulfur soil produces sweet onions with a mild flavor. Only onions from Georgia can be called Vidalia onions, and the name is trademark-protected. If you can find Vidalia onions in your store they are really tasty, but this recipe will be great with any type of sweet onion.

Marinated and Roasted Vidalia Onion Rings with Parmesan on KalynsKitchen.com

How to Make Roasted Vidalia Onion Rings with Parmesan:

(Scroll down for complete recipe with nutritional information.)

  1. Vidalia onions are white with a slightly golden skin, and usually they’re sold when they’re just medium-sized.
  2. After peeling, I sliced the onions into slices about 1/2 inches thick Try to make all the onions slices the same thickness, and separate onions into rings after slicing.
  3. Whisk together balsamic vinegar, olive oil, Spike Seasoning, and dried thyme, and marinate onions for 4 hours or longer.
  4. Let marinated onions drain well while you preheat the oven to 400 F.
  5. When oven is hot, arrange onions on a baking dish.
  6. Roast onions for 30-40 minutes, turning every 10 minutes, or until onions are well-browned, especially on the edges. (I was cooking this in my toaster oven or I would have spread them out on the pan a bit more.)
  7. Serve hot, with a sprinkling of grated Parmesan.

More Recipe Ideas with Vidalia Onions:

Greek Salad with Marinated Onions and Oregano from Kalyn’s Kitchen
Carmelised Vidalia Onions from Cook (almost) Anything At Least Once
Asian Cucumber Salad from Kalyn’s Kitchen
Vidalia Onion Fritters from Trini Gourmet
Middle Eastern Tomato Salad from Kalyn’s Kitchen

 Roasted Vidalia Onion Rings with Parmesan

Roasted Vidalia Onion Rings with Parmesan

Yield Makes 6 side dish servings
Prep Time 20 minutes
Cook Time 30 minutes
Additional Time 4 hours
Total Time 4 hours 50 minutes

Roasted Vidalia Onion Rings with Parmesan are a delicious side dish idea for everyone who likes sweet onions.


  • 4 medium-sized Vidalia onions (see notes)
  • 2 T balsamic vinegar
  • 1/4 tsp. Spike Seasoning (see notes)
  • 1/4 tsp. dried thyme
  • 1/4 cup olive oil
  • 2 T freshly grated Parmesan cheese
  • salt and fresh ground black pepper to taste


  1. Peel onions, cut in to slices about 1/2 inch (1.25 cm) thick, and separate into rings.
  2. Put onion rings into a large Ziploc bag.
  3. In a small bowl, stir together balsamic vinegar, Spike Seasoning, and dried thyme. Whisk in olive oil.
  4. Pour marinade into plastic bag and let onions marinate in the refrigerator 4 hours or longer, turning a few times if you’re home.
  5. Preheat oven to 400 F/200 C.
  6. While oven preheats, drain onions in a colander placed in the sink.
  7. Spray non-stick baking sheet with olive oil or non-stick spray.
  8. Arrange onions on baking sheet, putting them in a single layer as much as you can.
  9. Roast onions 30 minutes (or slightly longer), turning about every 10 minutes.
  10. Onions are done when they are nicely browned, especially on the edges.
  11. Remove onions to serving dish, sprinkle with Parmesan cheese, season to taste with salt and fresh ground black pepper and serve hot.


Use any type of sweet onion for this recipe. If you don't have Spike Seasoning (affiliate link) use any all purpose seasoning mix.

Nutritional information is calculated based on the fact that most of the marinade is drained away and not eaten.

Recipe created by Kalyn.

Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 119Total Fat: 5.2gSaturated Fat: .9gTrans Fat: 0gUnsaturated Fat: 3.9gCholesterol: 1.2mgSodium: 208mgCarbohydrates: 17gFiber: 2.1gSugar: 11gProtein: 2.3g

Nutrition information is automatically calculated by the Recipe Plug-In I am using. I am not a nutritionist and cannot guarantee 100% accuracy, since many variables affect those calculations.

If you make this recipe I'd love to hear how it turns out. Leave a star rating or share on social media with the hashtag #KALYNSKITCHEN, thanks!

Low-Carb Diet / Low-Glycemic Diet / South Beach Diet Suggestions:
Although onions are approved for every phase of the South Beach Diet, I’m guessing that sweet onions like I used for these Roasted Vidalia Onion Rings with Parmesan are higher in sugar, and would probably be phase 2 or 3 for South Beach. For other low-carb diets you could eat a very small amount of this, but use portion control if you’re watching your carbs. See nutritional information to see if you want to indulge!

Find More Recipes Like This One:
Use Side Dishes to find more side dish recipes like this one! Use the Recipes by Diet Type photo index pages to find more recipes suitable for a specific eating plan. You might also like to Follow Kalyn’s Kitchen on Pinterest to see all the good recipes I’m sharing there.

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    31 Comments on “Roasted Vidalia Onion Rings with Parmesan”

  1. If you click the link in the recipe it will tell you what it is. You can substitute other types of all-purpose seasoning.

  2. What is Spike Seasoning please

  3. wow these sound awesome! I love the sweetness of Vidalia onions 🙂

  4. All I can say is Yummmmm. I've really started to enjoy onions in my kitchen. This looks sooo good.

  5. Kalyn,
    Ok, so now I've gotta go buy some vidalias.

  6. I remember seeing this recipe and thinking it sounded wonderful. I love all things onion – I'm home from work on my lunch break and will slice and put in marinade before heading back to the office. Thanks Kalyn!

  7. This looks so crazy good. I have a serious onion addiction, so this is right up my alley.

    Trying it this weekend.

  8. Those onion rings look fabulous, Kalyn! I bet it would work with regular cooking onions too. And red onions!! Wouldn’t that be fantastic?


  9. Thanks, Kalyn, I like so much caramelized onions and yours look terrific!
    I am enjoying so much hosting WHB, and learn so many new vegs and cooking!

  10. Roasted onions are amazing! I bet these with the extra flavor from the marinade are out-of-this-world.

  11. I was going to caramelize some Vidalia onions to go on grilled hamburgers tonight – think I’ll try this instead! Thanks.