Parmesan-Crusted Onion Rings

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A crispy, savory keto snack made with thinly sliced onions and melted parmesan, baked to golden perfection. This keto (keto) ready in about 26 minutes pairs large onions, parmesan cheese, olive oil for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 140 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 10 min Cook: 16 min Serves 4 140 cal/serving
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Ingredients

Instructions

  1. Step 1: Slice onions into 1/4-inch thick rings, discarding the tough root ends.
  2. Step 2: Toss onion rings with 1 tbsp olive oil in a bowl until evenly moistened.
  3. Step 3: Sprinkle 1/4 cup grated parmesan cheese over the onions and toss gently to coat all pieces.
  4. Step 4: Arrange rings in a single layer in the air fryer basket, ensuring no overlapping.
  5. Step 5: Air fry at 375°F for 10 minutes, then shake the basket gently and cook 6 more minutes until edges are deeply golden and crisp to the touch.
  6. Step 6: Transfer to a paper towel-lined plate immediately to absorb excess oil and prevent sogginess.

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Frequently asked questions

How long does Parmesan-Crusted Onion Rings take to make?

Total time is about 26 minutes (10 min prep + 16 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Parmesan-Crusted Onion Rings?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep large onions from drying out.

Can I substitute ingredients in Parmesan-Crusted Onion Rings?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Parmesan-Crusted Onion Rings for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Parmesan-Crusted Onion Rings keto?

Yes — this recipe is tagged keto based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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