Air Fryer Blooming Onion
An air fryer blooming onion has the crispy, golden petals of the restaurant version with far less oil. A flour, egg and panko coating sticks to a cut onion and crisps in about 25 minutes at 375 °F, no deep fryer needed. This recipe shows how to cut the onion so it blooms, how to coat every petal and how to make a simple dipping sauce.
- Temperature
- 375°F190 °C
- Total time
- 1:20hrs
- Prep time
- 25min
- Servings
- 4
- Per serving
- 240kcal
Why the air fryer works for a blooming onion
A blooming onion is a whole onion cut into a flower and deep-fried, so every petal gets crisp. At home that means a big pot of hot oil, which is messy and dangerous. The air fryer surrounds the onion with hot air and gets the breading dry and crisp without it. A dry coating of flour, egg and panko is essential, because a wet batter would drip off and burn instead of setting.
The onion itself also behaves well. Sweet onions soften into a sweet, tender center as they cook, while the outer petals brown first. A light spray of oil on the panko helps it turn golden, since the crumbs have no fat of their own.
How to make a blooming onion in the air fryer
Tap a time to start a timer.
- Cut the onion Slice about ½ inch off the pointed top, leaving the root end intact, and peel the onion. Stand it on the root with the flat cut end facing up. Cut straight down from the top to about ½ inch above the board, making 16 evenly spaced wedges. Do not cut through the root.
- Soak and dry Put the onion in a bowl of ice water for so the petals open up. Lift it out and dry it very well, upside down on paper towels, then gently spread the petals apart.
- Flour the onion Mix the flour, paprika, garlic powder, onion powder, salt and cayenne in a large bowl. Place the onion in the bowl and spoon the flour mixture over it, working it between the petals. Shake off the extra.
- Add egg and panko Whisk the eggs and milk and spoon them over the floured onion, between the petals. Let the extra drip off, then press the panko over the onion, in and around every petal. Spray the whole onion generously with oil.
- Cook Preheat the air fryer to 375 °F for . Place the onion in the basket with the root side down and cook for . Check at . The onion is done when the petals are golden and the center is tender when pierced with a knife.
- Make the sauce While the onion cooks, stir the mayonnaise, ketchup, horseradish and lemon juice in a small bowl. Place the onion on a plate with the sauce in the center or on the side.
Times and temperatures
| Air Fryer Blooming Onion | Temperature | Time |
|---|---|---|
| Large onion, 1 lbCheck at 20 min | 375 °F (190 °C) | 25 min |
| Small onion, 10 oz | 375 °F (190 °C) | 18–20 min |
| Onion petals, deconstructedShake once | 375 °F (190 °C) | 10–12 min |
| Reheat leftovers | 350 °F (180 °C) | 4–5 min |
| Store-bought frozenFollow the package, cook from frozen | 375 °F (190 °C) | 15 min |
Times are a guide and depend on the size and wattage of your air fryer. See also air fryer cooking times for all foods.
Tips
- Choose a round, firm onion. A large sweet onion about 4 inches wide fits a 5–6 qt basket. Check that the onion will sit in the basket without touching the top.
- Keep the root attached. The root holds the petals together, so cut just short of it.
- Season generously. Onions are mild, so the flour needs salt, paprika and cayenne to give the coating flavor.
What to serve with a blooming onion
A blooming onion is a shareable appetizer that suits game day next to chicken wings. Serve it as a starter before steak or burgers, or on a snack board with dipping sauces. If you prefer onion in a more classic form, see onion rings, which are quicker to make.
Storing and reheating
A blooming onion is best eaten right away, but you can keep leftovers in a sealed container in the refrigerator for up to 2 days. To reheat, place the onion or loose petals in the air fryer at 350 °F for 4–5 minutes until hot and crisp. The sauce keeps for 5 days in the refrigerator.
Variations
- Spicy: Add 1 tsp Cajun seasoning to the flour and stir 1 tsp hot sauce into the dipping sauce.
- Parmesan: Mix ¼ cup grated Parmesan into the panko for a savory crust.
- Ranch seasoning: Replace the paprika and onion powder with 1 tbsp dry ranch seasoning mix.
- Onion petals: Cut the onion into wedges, separate the layers and bread them the same way. They cook in 10–12 minutes and are easier to share.
Cutting a blooming onion
The cut is the part most people worry about, but it takes about a minute. With the onion standing on its root, make four cuts like a plus sign and an X, which gives eight sections, then cut each section in half to make sixteen. Keep the tip of the knife about ½ inch from the root so the base stays whole. Then turn the onion upside down in the ice water, and the petals will begin to open as they soak. A sharp knife makes this safer, since a dull one slips on the onion skin.
If it does not turn out right
- The coating falls off
- The onion was wet when it was coated. Dry it thoroughly after the ice bath, and press the panko on firmly. Do not use a wet batter, which will drip off in the air fryer and make a mess.
- The outside is dark but the center is raw
- The onion is very large or the heat was too high. Use an onion about 4 inches wide, lower the heat to 350 °F and cook 5 minutes longer.
- The petals will not open
- The cuts did not go deep enough or the soak was skipped. Cut to within ½ inch of the root, and soak in ice water for the full 30 minutes.
Questions and answers
How long do you cook a blooming onion in the air fryer?
About 25 minutes at 375 °F for a large onion about 4 inches wide. A smaller onion of 10 oz needs 18–20 minutes, and a store-bought frozen one takes about 15 minutes according to the package.
How do you reheat a blooming onion in the air fryer?
Heat leftovers at 350 °F for 4–5 minutes until the petals are crisp again. Do not microwave them, which makes the coating soft.
Can I make a blooming onion without breading?
Yes. Brush the cut onion with oil and seasoning and cook at 350 °F for 25–30 minutes. The petals will be soft and caramelized, not crispy.
What kind of onion is best for a blooming onion?
A large sweet onion, such as a Vidalia, is best. It is mild, round and sturdy enough to hold its shape. A large yellow onion also works.
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