Air-Fried Bloomin’ Onion Flower with Sriracha Mayo

Every time my family walked into Outback Steakhouse when I was growing up, the bloomin’ onion was a non-negotiable. That giant golden flower of an onion, petals you could pull apart one by one, with that creamy peppery dipping sauce — I usually filled up on it before my meal even showed up.

But making one at home meant hauling out a pot of hot oil, and deep-frying a whole onion felt like an event I didn’t have the energy for on a Tuesday. Then I started playing with my air fryer, and this version honestly shocked me. The petals turn out shatteringly crisp and golden all the way through, with a fraction of the oil. I posted the reel on our page and the “recipe please!!” comments showed up within minutes — so here’s the whole method, including the sriracha-mayo bloomin’ sauce that I’m now putting on basically everything.

Why You’ll Love This Recipe

• All the crunch, almost none of the oil. A light spritz of cooking spray and the air fryer does the heavy lifting — no pot of hot oil to deal with.
• Restaurant drama at home. Cutting an onion into a blooming flower never stops feeling impressive, even after the twentieth time.
• The sriracha-mayo sauce. Creamy, tangy, with just enough heat. You’ll double the batch on purpose for dipping fries later.
• Impossible to serve without a crowd forming. Petals get pulled apart and eaten standing up in the kitchen — fair warning.

Ingredients

For the onion flower:

• 1 large sweet onion (about 1 lb — Vidalia or Walla Walla are ideal)
• 1 cup all-purpose flour
• 1 tablespoon smoked paprika
• 1 teaspoon garlic powder
• 1 teaspoon onion powder
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 1/2 teaspoon cayenne pepper (optional, for a little kick)
• 2 large eggs
• 2 tablespoons milk
• 1 1/2 cups panko breadcrumbs
• Olive oil or avocado oil cooking spray

For the sriracha-mayo bloomin’ sauce:

• 1/2 cup mayonnaise
• 2 tablespoons sriracha (add a third for extra heat)
• 1 tablespoon ketchup
• 1 teaspoon prepared horseradish
• 1/2 teaspoon smoked paprika
• 1 teaspoon lemon juice
• Pinch of salt

Method

1. Cut the bloom. Peel the onion and slice about 1/2 inch off the top, keeping the root end intact. Place it root-side down. Starting 1/2 inch from the root, make vertical cuts straight down, spaced about 1/4 inch apart, all the way around — don’t cut through the root or the petals will fall off. Flip it over and gently loosen the petals with your fingers so they fan open like a flower.
2. Season the flour. In a large bowl, whisk together the flour, smoked paprika, garlic powder, onion powder, salt, black pepper, and cayenne. In a second bowl, beat the eggs with the milk. In a third, pour the panko.
3. Bread the flower. Work the seasoned flour into every layer of the onion — any bare spot is a petal that won’t crisp. Dunk the whole onion into the egg, lifting the petals so it reaches everywhere. Let the excess drip off, then press the panko firmly all over, tucking it between petals.
4. Chill to set. Refrigerate the breaded onion on a plate for 20 to 30 minutes. This helps the coating adhere so the petals don’t shed their crust in the air fryer.
5. Air-fry. Preheat the air fryer to 375°F. Spray the onion generously on all sides with cooking spray, then place it root-side down in the basket. Air-fry for 10 minutes, then spray any dry-looking spots and cook 3 to 5 minutes more, until deeply golden and crisp.
6. Whisk the sauce. While the onion cooks, stir together the mayonnaise, sriracha, ketchup, horseradish, smoked paprika, lemon juice, and salt until smooth. Taste and adjust — more sriracha for heat, more lemon for brightness.
7. Serve immediately. Move the hot onion to a serving plate with the sauce in the center, and serve while it’s crackling hot. The petals are meant to be pulled off and dunked, one by one.

Pro Tips for the Crispiest Bloom

• Choose a big, fresh, firm onion. A softball-sized sweet onion with tight layers blooms best — small or soft onions make floppy petals.
• Keep the root intact, always. It’s the hinge holding the whole flower together. Nick it and petals drop.
• Don’t skip the chill. Twenty minutes in the fridge is the difference between a crust that clings and one that slides off.
• Spray generously. Only surfaces with a light coat of oil get truly crispy in the air fryer.

Variations

• Classic copycat: Swap the sriracha sauce for the restaurant-style version — mayo, horseradish, paprika, ketchup, and a pinch of cayenne — for pure steakhouse nostalgia.
• Ranch version: Bread with the same seasoning but serve with homemade ranch for dipping. Kids demolish this one.
• Spicy Cajun bloom: Replace the paprika with Cajun seasoning in the flour and add cayenne to the sauce. Not subtle, very good.

Storage & Reheating

This is a make-it-and-eat-it situation — it’s best within minutes of the air fryer. If you somehow have leftovers, refrigerate up to 2 days and re-crisp at 375°F for 3 to 4 minutes. Never microwave it. The sauce keeps sealed in the fridge up to a week.

Nutrition Estimate

Per serving (1/4 of onion with about 2 tablespoons sauce): approximately 320 calories, 8g protein, 38g carbs, 16g fat. Rough estimates — the spray oil and sauce portions move the numbers.

Frequently Asked Questions

Why did my petals fall off?
You cut through the root end. Leave at least 1/2 inch of root intact — it’s the base the whole flower is attached to.

Can I make this ahead of time?
You can bread it up to 2 hours ahead and keep it chilled, then air-fry right before serving. Don’t air-fry ahead — the crispness fades fast.

Can I bake it instead?
Yes — bake on a wire rack set over a sheet pan at 425°F for 25 to 30 minutes, spraying well. It’s good, but the air fryer gets it crisper.

My coating is bare in spots — what happened?
The flour didn’t reach between the petals before the egg went on. Take the extra minute to work the seasoned flour into every layer — that’s what the egg and panko grip onto.

Serving Notes

Set the bloomin’ onion on a big board with the sauce right in the middle and let everyone pull petals. It disappears in about four minutes flat, so make two if you’re feeding more than four people. Enjoy the crunch — you earned it.