Air Fryer Crispy Onions

If you’ve ever topped a green bean casserole with those store-bought crispy onions, you already know how much flavor and crunch they bring to a dish. But what if I told you that you could make your own crispy onions at home—in the air fryer—with just a few simple ingredients and none of the greasy mess?

These Air Fryer Crispy Onions are a total game-changer. Light, golden, and incredibly crunchy, they add that irresistible savory bite to just about anything—salads, burgers, casseroles, soups, or even as a snack straight from the bowl. And let’s be honest, anything that can go from prep to plate in under 30 minutes and still taste this good deserves a permanent spot in your recipe rotation.

I’ve been on a bit of an air fryer kick lately (haven’t we all?), and I can honestly say this is one of my favorite discoveries. You get all the crispness of deep-fried onions but with way less oil and cleanup. Plus, the flavor is on another level. The buttermilk softens the onions just enough, while the seasoned flour adds that classic savory crust that crisps up beautifully in the air fryer.

Let’s get into how to make these crave-worthy crispy onions right in your air fryer!

Ingredients You’ll Need

• 1 large yellow onion, thinly sliced

• ½ cup buttermilk

• ½ cup all-purpose flour

• ¼ cup cornstarch

• ½ teaspoon paprika

• ½ teaspoon garlic powder

• Salt and black pepper, to taste

• Olive oil spray

Simple, pantry-friendly ingredients, right? The magic is really in the method—and the air fryer, of course.

STEP 1: SOAK THE ONIONS

First things first, slice your onion very thin. This is key to getting that ultra-light crisp texture we’re going for. If you’ve got a mandoline, now’s the time to use it. If not, a sharp knife and a steady hand will do the trick.

Once your onions are sliced, place them in a bowl and pour the buttermilk over the top. Toss them gently to make sure everything is coated, then let them soak for about 10 to 15 minutes. This does two things—it softens the onions a bit so they cook more evenly, and it gives them a slight tangy flavor that makes them extra delicious.

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STEP 2: MAKE THE COATING MIXTURE

While the onions are soaking, go ahead and get your flour mixture ready. In a shallow bowl, mix together the all-purpose flour, cornstarch, paprika, garlic powder, and a good pinch of salt and black pepper.

Why the cornstarch? It helps create that super-light, ultra-crispy texture we all love in a good fried onion. Combined with flour, it gives the perfect balance between crunch and structure.

STEP 3: DREDGE THE ONIONS

Once the onions are done soaking, remove a handful at a time from the buttermilk and dredge them in the flour mixture. Make sure to press them down lightly so the coating really sticks, then shake off any extra. You don’t want a super thick coating—just enough to give them that signature crisp.

This step can get a little messy, but trust me, it’s worth it. You’ll start to see those onion pieces transform right before your eyes.

STEP 4: AIR FRY IN BATCHES

Here’s where the magic happens.

Lightly spray your air fryer basket with olive oil spray to help prevent sticking. Then, place the coated onions in the basket in a loose, even layer. It’s super important not to overcrowd the basket here. You want the air to circulate around each piece so everything crisps up evenly.

Give the tops of the onions a quick spritz of oil too—this helps them brown and crisp without drying out.

Set your air fryer to 375°F and cook for 8 to 10 minutes. Don’t forget to shake the basket about halfway through so the onions cook evenly.

So now that your kitchen smells like heaven and your air fryer is working its magic, it’s time to wrap up the final steps and talk about how to get that perfectly crispy texture we’re after. This part is where it all comes together—and trust me, once you’ve made these crispy onions from scratch, you’ll never reach for the canned version again.

In this section, I’ll guide you through finishing off the air frying process, offer up a few helpful tips, and share some fun ways to use these golden onion strips in your everyday cooking.

STEP 5: COOL FOR MAXIMUM CRISPINESS

As soon as your onions are golden brown and crisp, remove them from the air fryer and transfer them to a wire rack or paper towel-lined plate. This step is more important than it seems—letting them cool on a rack allows air to circulate around them, which helps them firm up and get even crunchier.

If you taste one right out of the air fryer and think it’s not quite crisp enough, give it a minute. These crispy onions firm up as they cool, so patience really pays off here.

And remember, every air fryer cooks a little differently. If yours runs a little hot or cold, you might need to tweak the time by a minute or two in either direction. Keep an eye on that first batch and adjust from there.

Tips for Crispy Success

Alright, now that you’ve got the basic steps down, let’s talk tips. These are the little things that can make a big difference when it comes to getting the perfect batch of crispy onions.

• Use a Mandoline for Even Slices: Thin, uniform slices = even cooking and better texture. A mandoline slicer makes this quick and easy, but a sharp knife works in a pinch.

• Don’t Skip the Soak: The buttermilk soak does more than add flavor. It softens the onions and helps the coating stick, so you don’t end up with dry, floury bits.

• Work in Batches: Resist the temptation to fill up the air fryer basket. Overcrowding means steam, and steam means soggy onions. A light, even layer is the way to go.

• Spray Oil Strategically: A light mist of oil on both the basket and the top of the onions helps them get that deep golden color without excess grease. Don’t overdo it—just a light spray is enough.

• Let Them Cool on a Rack: If you place them straight onto a plate, the bottom layer can get soggy. Cooling on a wire rack keeps everything crisp.

Fun Ways to Use Air Fryer Crispy Onions

These crispy onion strings are more than just a topping—they’re a flavor-boosting, texture-adding secret weapon in your kitchen. Here are a few of my favorite ways to use them:

• Green Bean Casserole: This one’s a no-brainer. Ditch the store-bought fried onions and top your homemade green bean casserole with these for next-level crunch.

• Burgers and Sandwiches: Stack a handful of crispy onions onto burgers, pulled pork sandwiches, or even grilled cheese for a satisfying bite.

• Salads: Sprinkle them over mixed greens, chopped salads, or even pasta salads for a pop of flavor and texture.

• Tacos and Burrito Bowls: These make an awesome crunchy topping for tacos, rice bowls, and wraps.

• Snack Attack: Honestly? They’re so good on their own that I’ve been known to snack on them straight from the tray. No shame.

Variations and Add-Ins

Once you’ve got the base recipe down, you can easily switch things up depending on what flavors you’re in the mood for. Here are a few fun ideas to try:

• Spicy Version: Add a pinch of cayenne or chili powder to the flour mixture for a little heat.

• Herb Blend: Mix in a bit of dried thyme, oregano, or Italian seasoning for a herby twist.

• Sweet Onion Style: Use Vidalia or another sweet onion variety for a milder, sweeter flavor profile that’s great on savory dishes.

• Gluten-Free Swap: Sub in a gluten-free all-purpose flour blend and you’re good to go.