Kalyn's Kitchen

Marinated and Roasted Vidalia Onion Rings with Parmesan

Marinated and Roasted Vidalia Onion Rings with Parmesan are a delicious side dish idea for people who like sweet onions, and this is a super easy side dish! Use Side Dishes to find more side dish recipes like this one!

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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 Marinated and 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.

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. Vidalia onions are my featured plant ingredient for Weekend Herb Blogging, hosted this week by Cinzia from Cindystar.

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

Vidalia onions are white with a slightly golden skin, and usually they’re sold when they’re just medium-sized. 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.

Whisk together balsamic vinegar, olive oil, Spike Seasoning, and dried thyme, and marinate onions for 4 hours or longer. Let marinated onions drain well while you preheat the oven to 400 F. When oven is hot, arrange onions on a baking dish.

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.) 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 with Cilantro and Vidalia Onions from Kalyn’s Kitchen
Vidalia Onion Fritters from Trini Gourmet
Middle Eastern Tomato Salad from Kalyn’s Kitchen

Marinated and Roasted Vidalia Onion Rings with Parmesan

Marinated and Roasted Vidalia Onion Rings with Parmesan are a delicious side dish idea for people who like sweet onions.


  • 4 medium-sized Vidalia onions or other types of sweet onions
  • 2 T balsamic vinegar
  • 1/4 tsp. Spike Seasoning
  • 1/4 tsp. dried thyme
  • 1/4 cup olive oil
  • 1-2 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.
  4. Whisk in olive oil.
  5. Pour marinade into plastic bag and let onions marinate in the refrigerator 4 hours or longer, turning a few times if you’re home.
  6. Preheat oven to 400 F/200 C.
  7. While oven preheats, drain onions in a colander placed in the sink.
  8. Spray non-stick baking sheet with olive oil or non-stick spray.
  9. Arrange onions on baking sheet, putting them in a single layer as much as you can.
  10. Roast onions 30-40 minutes, turning about every 10 minutes.
  11. Onions are done when they are nicely browned, especially on the edges.
  12. Remove onions to serving dish, sprinkle with Parmesan cheese, season to taste with salt and fresh ground black pepper and serve hot.


Recipe created by Kalyn.

All images and text ©

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 in these Marinated and 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 one Vidalia Onion has 16 carbs, so use portion control if you’re watching your carbs.

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    31 Comments on “Marinated and 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. wow these sound awesome! I love the sweetness of Vidalia onions 🙂

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

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

  5. 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!

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

    Trying it this weekend.

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


  8. 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!

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

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