These Air Fryer Crispy Onions are crunchy, golden, savory, and surprisingly easy to make with very little oil. Thinly sliced onions are lightly coated with seasoned flour and breadcrumbs, then air fried until crisp around the edges and beautifully browned.
They are perfect for topping burgers, casseroles, green beans, salads, mashed potatoes, sandwiches, or creamy soups. You can also serve them as a crunchy snack with ranch, spicy mayo, or your favorite dipping sauce.
Why You Will Love This Recipe
Traditional crispy onions are usually deep-fried in a large amount of oil. The air fryer gives you a similar crunchy texture while using only a light coating of cooking spray or oil.
The recipe is also inexpensive and made with simple pantry ingredients. Once you learn the basic method, you can easily change the seasonings to make spicy, garlic-Parmesan, ranch, or smoky crispy onions.
Ingredients
- 2 large yellow or sweet onions
- 1/2 cup all-purpose flour
- 1/2 cup panko breadcrumbs
- 1 teaspoon garlic powder
- 1 teaspoon onion powder
- 1/2 teaspoon smoked paprika
- 1/2 teaspoon salt
- 1/4 teaspoon freshly cracked black pepper
- 1 large egg
- 1/3 cup milk or buttermilk
- Cooking spray or 1 tablespoon olive oil
Ingredient Notes
Onions: Yellow onions provide a classic savory flavor, while sweet onions such as Vidalia become slightly sweeter as they cook.
Panko: Panko breadcrumbs create a lighter, crunchier coating than regular fine breadcrumbs.
Buttermilk: Buttermilk adds a mild tang and helps the coating stick. Regular milk works perfectly well if that is what you have.
Oil: A light mist of oil helps the onions turn golden and crisp in the air fryer. You do not need to soak them in oil.
How to Make Air Fryer Crispy Onions
- Peel the onions and slice them very thinly, about 1/8-inch thick.
- Separate the slices gently into rings and smaller pieces.
- In a shallow bowl, whisk together the egg and milk.
- In another bowl, combine the flour, panko, garlic powder, onion powder, smoked paprika, salt, and black pepper.
- Dip a small handful of onion pieces into the egg mixture.
- Allow excess liquid to drip away.
- Toss the onions in the seasoned breadcrumb mixture until lightly coated.
- Shake away excess breading.
- Repeat with the remaining onions.
- Preheat the air fryer to 375°F for about three minutes.
- Arrange the coated onions in a loose, mostly single layer in the air fryer basket.
- Lightly mist the tops with cooking spray.
- Air fry for about five minutes.
- Open the basket and carefully toss or stir the onions.
- Spray lightly again if any dry floury areas remain.
- Continue air frying for another four to seven minutes, checking frequently.
- Remove the onions once they are golden brown and crisp.
- Repeat in batches until all the onions are cooked.
The Secret to Extra-Crispy Onions
Do not overcrowd the air fryer. Air needs to circulate around the onions for them to become crisp. If you pile too many pieces together, trapped steam will make them softer.
Thin, evenly sliced onions also cook more consistently. A mandoline slicer can be useful, but always use its safety guard and follow the manufacturer’s instructions.
Finally, watch the onions closely during the last few minutes. Thin onion pieces can go from golden to overly dark surprisingly quickly.
Simple Unbreaded Version
If you want lighter crispy onions without flour or breadcrumbs, thinly slice two onions and toss them with about one tablespoon olive oil, a pinch of salt, and your favorite seasonings.
Air fry at 350°F for about 12 to 18 minutes, shaking the basket every few minutes. The onions will become caramelized and crisp around the edges rather than having a breaded fried-onion coating.
Garlic Parmesan Crispy Onions
Add 1/4 cup finely grated Parmesan to the breadcrumb mixture and increase the garlic powder slightly.
The Parmesan develops a savory golden crust in the air fryer and makes these especially good as a topping for pasta, mashed potatoes, or roasted vegetables.
Spicy Crispy Onions
Add cayenne pepper, Cajun seasoning, chili powder, or crushed red pepper to the coating.
Serve them with ranch dressing or a mixture of mayonnaise and hot sauce for an easy appetizer.
Ways to Use Crispy Onions
Sprinkle them over green bean casserole, baked macaroni and cheese, mashed potatoes, burgers, hot dogs, sandwiches, salads, creamy soups, or roasted vegetables.
They are particularly good on casseroles because they add a crunchy texture that contrasts with a creamy filling.
You can also use them anywhere you would normally use packaged crispy fried onions.
How to Keep Them Crispy
Let the onions cool completely before storing them. Placing warm onions in a closed container traps steam and quickly softens the coating.
If you are making them for a casserole, prepare them earlier in the day and add them immediately before the final baking stage.
Storage and Reheating
Store fully cooled crispy onions in an airtight container in the refrigerator for up to three days.
To restore their crunch, air fry at 350°F for about two to four minutes. Watch carefully because they are already browned and can burn quickly.
The microwave is not recommended when crispness is important because it tends to soften the coating.
Printable Recipe Card
Air Fryer Crispy Onions
Prep Time: 15 minutes
Cook Time: 10 to 12 minutes per batch
Total Time: About 30 minutes
Yield: About 3 cups
Category: Side Dish, Topping, Snack
Cooking Method: Air Fryer
Quick Instructions
- Thinly slice and separate the onions.
- Whisk egg and milk in one bowl.
- Combine flour, panko, and seasonings in another.
- Dip onions in egg mixture, then coat with breadcrumbs.
- Arrange loosely in the air fryer basket.
- Lightly spray with oil.
- Air fry at 375°F for 9 to 12 minutes, tossing halfway through.
- Cook in batches until golden and crisp.
- Serve immediately or use as a crunchy topping.
Final Thoughts
These Air Fryer Crispy Onions give you crunchy, golden onion goodness without traditional deep frying. They are easy to make, inexpensive, and incredibly useful as a topping for everything from burgers and casseroles to salads and mashed potatoes.
Slice the onions thinly, avoid overcrowding the basket, and keep an eye on the final few minutes for perfectly crisp, golden results.