Air Fryer Copycat Outback Bloomin’ Onion (+ Sauce!)

If you want to make the Outback blooming onion in the air fryer at home, this is the copycat recipe you’ve been looking for. It’s every bit as crispy and golden as the restaurant version — a whole sweet onion cut into petals, breaded in seasoned flour, and air-fried until crunchy — but with a fraction of the oil and none of the deep-frying mess. Best of all, I’m including the exact bloomin’ onion sauce recipe below, so you get the full Outback experience start to finish.

This is one of those appetizers that turns an ordinary weeknight into an event. Prep is quick, cleanup is minimal, and the payoff is a showstopping “flower” everyone reaches for the second it hits the table.

Why You’ll Love This Bloomin’ Onion Recipe

• It’s a copycat you can trust. If you love recreating restaurant favorites, it pairs perfectly with a bowl of Copycat Outback Steakhouse Walkabout Soup for a full Outback night at home.
• It’s genuinely easy. No deep fryer, no vat of hot oil — just an onion, a two-bowl breading station, and your air fryer.
• It’s lighter than the original. Air frying uses a fraction of the oil, so you get the crunch without the grease.
• The sauce makes it. That creamy, tangy, slightly spicy dipping sauce is the whole point — and the recipe is right here.

Air Fryer Blooming Onion Ingredients

You only need a handful of pantry staples to make this blooming onion recipe in the air fryer:

• Onion — a large Vidalia or other sweet onion works best. Yellow or even red onions will do in a pinch, but sweet onions bloom most beautifully.
• All-purpose flour — for the crispy coating. Swap in a gluten-free all-purpose blend to make it gluten-free.
• Eggs — they bind the breading to the onion so it stays put in the air fryer.
• Buttermilk — homemade or store-bought; it adds tang and helps the coating cling.
• Seasonings — onion powder, garlic powder, sweet paprika, kosher salt, and cayenne pepper. For an even bolder, steakhouse-style flavor, a pinch of Outback Steak Seasoning in the flour is a great shortcut.

How to Make Outback Steakhouse Bloomin’ Onion Sauce

The dipping sauce is what makes a bloomin’ onion taste like Outback — creamy, tangy, and just a little spicy. Here’s exactly how to make the Outback Steakhouse bloomin’ onion sauce at home. Stir it together while the onion cooks and it’s ready the moment the onion comes out.

Sauce ingredients:

• 1/2 cup mayonnaise
• 2 tablespoons ketchup
• 2 tablespoons cream-style horseradish (or prepared horseradish, to taste)
• 1/2 teaspoon smoked or sweet paprika
• 1/4 teaspoon garlic powder
• 1/4 teaspoon dried oregano
• 1/8 teaspoon cayenne pepper (more if you like heat)
• Pinch of kosher salt and black pepper

To make it: Whisk everything together in a small bowl until smooth. Taste and adjust — more horseradish for bite, more cayenne for heat. For the best flavor, cover and chill for 20–30 minutes so the seasonings meld while your onion air fries.

If creamy dips are your thing, a batch of homemade Thousand Island dressing is another excellent option to set out alongside.

How to Cut a Blooming Onion

Cutting the onion is the only slightly fussy part, and it’s easy once you see the pattern. The goal is petals that fan open without the onion falling apart.

1. Trim the top. Slice about 1/2 inch off the pointed top of the onion, then peel away the papery skin.
2. Flatten the base. Cut a thin slice off the root end so the onion sits flat — but leave the root itself intact, because that’s what holds the petals together.
3. Make your cuts. Set the onion cut-side down. Starting about 1/2 inch from the root, cut straight down into 12–16 evenly spaced wedges, working around the onion like slicing a pie. Never cut through the root.
4. Bloom it. Flip the onion over and gently spread the layers apart with your fingers, working from the center out, until it opens into a flower.
5. Soak it (optional but worth it). Soak the cut onion in cold water for at least 30 minutes. This relaxes the petals so they open wide and makes the whole thing easier to handle and coat.

How to Make an Outback Copycat Blooming Onion in the Air Fryer

Once your onion is cut and bloomed, the rest comes together fast.

Step 1 — Preheat. Preheat the air fryer to 375°F (190°C).

Step 2 — Set up your breading station. In one bowl, whisk the flour with the onion powder, garlic powder, paprika, salt, and cayenne. In a second bowl, whisk the eggs and buttermilk.

Step 3 — Coat the onion. Dip the bloomed onion into the egg-buttermilk mixture, getting it down into the petals. Then dredge in the seasoned flour, shaking off the excess. Repeat both dips so it’s fully, evenly coated — this double layer is what gives you that signature crunch.

Step 4 — Air fry. Spray the coated onion generously with cooking spray so it browns. Place it in the air fryer basket flat side down and cook for 15–20 minutes, until deep golden and crisp. Flip halfway through so both sides color evenly.

Step 5 — Serve. Let the onion rest a few minutes, then serve it hot with that bloomin’ onion sauce for dipping. Crispy air fryer Ore-Ida french fries on the side turn it into a full appetizer spread.

Tips for the Best Air Fryer Blooming Onion

• Pick a big, firm sweet onion. Vidalia or Walla Walla are ideal — large enough to bloom dramatically and sweet enough to balance the seasoned coating. Avoid any with soft spots.
• Cut carefully and keep the root intact. A sharp knife and clean cuts keep the petals attached so the onion holds its shape.
• Don’t skip the soak. Thirty minutes in cold water makes the petals open wider and the breading go on more evenly.
• Double-coat for maximum crunch. Egg wash, flour, egg wash, flour — two full rounds is the secret to a crust that stands up.
• Spray, don’t drench. A light, even coat of cooking spray browns the coating without making it greasy. Re-spray any dry, floury patches before cooking.
• Cook to color, not just the clock. Air fryers vary, so start checking at 15 minutes and pull it when it’s deep golden and crisp.

What to Serve With a Bloomin’ Onion

A bloomin’ onion is rich, so it shines next to fresh, simple sides:

• The classic bloomin’ onion sauce above — non-negotiable.
• A crisp green salad with a light vinaigrette to cut the richness.
• Air-fried sides like crispy Ore-Ida french fries, which you can cook in the same air fryer right after the onion.
• A cozy soup such as Copycat Outback Walkabout Soup to round out a full steakhouse-style meal at home.

How to Store a Blooming Onion

Have leftovers? Here’s how to keep them:

1. Let the onion cool completely to room temperature.
2. Wrap it in foil or place it in an airtight container.
3. Refrigerate for up to 2–3 days.

The dipping sauce keeps separately in a covered container in the fridge for up to a week.

How to Reheat a Bloomin’ Onion From Outback (or Homemade)

The air fryer is by far the best way to bring a bloomin’ onion back to life — it re-crisps the coating instead of turning it soggy the way a microwave does. Whether it’s homemade leftovers or a takeout box from Outback, here’s how to reheat a bloomin’ onion so it tastes freshly made:

• Air fryer (best): Preheat to 350°F (175°C). Place the onion in the basket and heat for 3–5 minutes, until hot and crisp again. Check at 3 minutes so the petals don’t over-brown.
• Oven: Bake at 350°F (175°C) on a wire rack set over a baking sheet for 8–10 minutes.
• Skip the microwave. It heats the onion through but leaves the coating limp and soft — you lose the crunch that makes it worth eating.

Bloomin’ Onion Recipe FAQs

What kind of onion is best for a blooming onion? A large, firm sweet onion — Vidalia or Walla Walla — blooms widest and balances the savory coating. Yellow onions work too but are sharper.

Why isn’t my coating sticking? Two things usually fix it: soak and dry the onion first, and use the full double-dip (egg, flour, egg, flour). Getting the egg wash down into the petals before flouring is key.

How do I make this bloomin’ onion recipe gluten-free? Swap the all-purpose flour for a 1:1 gluten-free all-purpose blend. Everything else stays the same.

Can I make the sauce ahead? Yes — it’s actually better made ahead. Stir it together and chill it for at least 20–30 minutes (or up to a week) so the flavors meld.