How to Make Viral Parmesan Onion Rings

These baked keto onion rings are blowing up for a reason—and it’s not just because they’re low-carb. This TikTok-style hack uses shredded parmesan to create ultra-crispy, golden rings with zero breadcrumbs and no deep frying needed.

I have to be honest—this isn’t the recipe I thought I needed. I’m usually all about my Air Fryer Sweet Potato Fries or Jicama Fries when I want something crispy and satisfying. But sometimes… I need something different.

Onion rings? Definitely not something I thought I could enjoy on a keto diet. I mean, breading, frying—it’s a no-go, right?

But then I saw this viral TikTok hack floating around using just parmesan and onions… and I had to try it. I was super skeptical at first. I didn’t think they’d get crispy, or that the flavor would hit the same way as traditional onion rings.

I was so wrong.

These are absolutely amazing. Crispy, cheesy, savory, and ridiculously easy to make. No breadcrumbs. No deep frying. Just a handful of ingredients and a simple method that actually works.

If you’ve been craving something crunchy on your low-carb journey, this might just be the recipe you didn’t know you needed either. Trust me—you’ll want to save this one.

Ingredient Notes

• Onions – Go for firm, fresh onions. I prefer white onions for their mild, slightly sweet flavor once baked. To get those perfect, even slices, I love using a mandoline slicer—just be super careful and always use the guard (or a cut-resistant glove). Even slices help everything cook evenly and crisp up nicely!
• Parmesan cheese – This is the secret to that crispy, golden “breading” without any actual breadcrumbs! I personally prefer shredding my own parmesan cheese—it melts better and doesn’t have the anti-caking agents that can affect texture. But if you’re in a rush, pre-shredded parmesan works too—just make sure it’s the real deal and not the powdery kind.
• Olive oil (optional) – A light brush on top of the onion rings helps with browning and adds a touch of richness. Totally optional, but worth it if you like that golden finish.
• Salt, garlic powder, and paprika – Simple seasonings that go a long way! You can adjust these to your taste, or even add a pinch of chili powder for a little heat. The paprika gives a subtle smokiness and helps with color too.

Step-by-Step Instructions: Super Crispy Keto Onion Rings

1. Preheat the oven
Set your oven to 400°F (200°C) and line a baking sheet with parchment paper. This is key—parchment helps the cheese crisp up without sticking. Don’t use foil or wax paper; they won’t give you the same results.

2. Prep your onions
Peel and slice 2 medium white onions into ¼-inch thick rounds. To get those perfect, even slices, I highly recommend using a mandoline slicer—just be sure to use the hand guard or wear a cut-resistant glove for safety. Uniform thickness ensures even cooking and crispiness.

3. Build the parmesan “molds”
Scoop about 1 tablespoon of shredded parmesan onto the parchment-lined sheet and gently press it into a flat circle (a little wider than your onion rings). This will be the crispy cheese base.

4. Add the onion rings
Place one onion ring directly on top of each parmesan circle.

5. Top with more cheese & press
Add another tablespoon of parmesan over each onion ring, covering it completely. Use the back of a spoon to gently press it down—this helps the cheese bind to the onion and creates that signature crispy edge once baked.

6. Season generously
Sprinkle the tops with salt, garlic powder, and paprika. This seasoning blend adds flavor and helps enhance the golden color as it bakes. You can even add a pinch of chili flakes if you like a little heat.

7. Bake until golden and bubbly
Place the tray in the oven and bake for 15–20 minutes, or until the cheese is deep golden brown and crispy around the edges. Keep an eye on them—every oven is different, and parmesan can go from golden to burnt quickly.

8. Let them cool for max crunch
This is key: cool the onion rings for 10–15 minutes on the baking sheet before serving. This allows them to set and firm up so they’re ultra crispy and easy to lift without breaking.

How to Store Keto Onion Rings

Fridge

• Let the onion rings cool completely before storing.
• Place them in an airtight container lined with a paper towel (to absorb excess moisture).
• Store in the fridge for up to 3–4 days.

Reheating (for max crispiness)

• Air Fryer: Reheat at 375°F (190°C) for 3–4 minutes. This is the best way to bring back that crisp!
• Oven/Toaster Oven: Bake at 375°F (190°C) for 5–7 minutes on a parchment-lined tray.

Freezer (not ideal but possible):

• These are best fresh, but if you must, flash-freeze them on a baking sheet first, then transfer to a freezer bag.
• Reheat directly from frozen in the oven or air fryer until hot and crispy.

More Keto Snacks

• The Best Cottage Cheese Chips
• Keto Crackers • Best Low Carb Crackers
• Homemade Flaxseed Crackers

Viral High-Protein Keto Onion Rings Hack (No Breadcrumbs, No Frying!)

3.60 from 5 votes

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Prep time 10 minutes mins

Cook Time 15 minutes mins

Yields 6 servings

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Description

 

These crispy parmesan onion rings are a low-carb snack made without breadcrumbs or deep frying. Thin onion rings are baked with shredded parmesan until golden, cheesy, and crisp around the edges. Serve them with the creamy dipping sauce for the perfect keto-friendly appetizer or side.

Ingredients

  

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For the Onion Rings

• 2 medium white onions sliced into 1/8 to 1/4-inch thick rings
• 2 cups shredded parmesan cheese
• 1/2 tsp garlic powder or to taste
• 1/2 tsp smoked paprika or to taste
• 1/2 tsp Italian seasoning optional
• Salt and pepper to taste
• Olive oil spray for greasing the parchment

For the Creamy Dipping Sauce

• 1/4 cup mayonnaise
• 2 tbsp sour cream or Greek yogurt
• 1 tsp mustard
• 1 tsp sugar-free ketchup optional
• 1/2 tsp garlic powder
• 1/4 tsp smoked paprika
• Salt and pepper to taste
• 1 tsp lemon juice or pickle juice optional

Instructions

 

• Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper and lightly spray it with olive oil to help prevent sticking.
• Peel the onions and slice them into even rings. For crispier onion rings that are easier to bite through, slice them closer to 1/8 inch thick. For a more onion-forward bite, slice them up to 1/4 inch thick.
• Add about 1 tablespoon of shredded parmesan to the prepared baking sheet and gently spread it into a small circle.
• Place one onion ring on top of the parmesan circle.
• Add another tablespoon of shredded parmesan over the onion ring, then gently press down with the back of a spoon so the cheese sticks to the onion.
• Season with garlic powder, smoked paprika, Italian seasoning, salt, and pepper.
• Bake for 15–20 minutes, or until the parmesan is melted, golden, and crisp around the edges. Keep an eye on them near the end because parmesan can brown quickly.
• Let the onion rings cool on the baking sheet for 10–15 minutes before lifting them. This helps the cheese set and makes them easier to remove without breaking.
• While the onion rings cool, make the dipping sauce. In a small bowl, stir together the mayonnaise, sour cream or Greek yogurt, mustard, sugar-free ketchup, garlic powder, smoked paprika, salt, pepper, and lemon juice or pickle juice until smooth.
• Serve the crispy parmesan onion rings with the creamy dipping sauce.

Notes

• Use shredded parmesan, not the dry powdery parmesan from a can. Freshly shredded parmesan melts and crisps best, but good-quality pre-shredded parmesan can work too.
• Lightly greasing the parchment paper helps prevent the cheese from sticking.
• Let the onion rings cool before removing them from the tray. They crisp up and release more easily as they cool.
• Thinner onion slices, about 1/8 inch, will be crispier and easier to bite through.
• If using an air fryer, place the onion rings on air fryer parchment and cook at 375°F for about 6–8 minutes, checking often.
• These are best served fresh, but leftovers can be reheated in the oven or air fryer to bring back some crispiness.

Serving Size
1 serving is about 4–5 onion rings, depending on the size of the onions and how much parmesan is used.

Nutrition Facts

Amount per serving.

Calories

145kcal

Total Carbs

4g

Net Carbs

Protein

12g

Fat

9g

Fiber

1g

Sugar

2g

How do we calculate the nutrition info?

These nutrition facts listed are determined using nutrition information from the USDA Food Database. Our nutrition facts are accurate, but if you are using different products, please make your calculations. Net carb count is calculated by subtracting both fiber and sugar alcohols because they don’t raise blood sugar.

Course Snack

Cuisine American

Keyword keto onion rings

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