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Air fryer homemade blooming onion with crispy golden onion petals, tender center, and a creamy dipping sauce, served as a lighter version of the classic restaurant appetizer.
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Air Fryer Homemade Blooming Onion - Crispy, Shareable, and Lighter Than Fried

Prep Time15 minutes
Cook Time20 minutes
Total Time35 minutes
Servings: 4 servings

Ingredients

  • 1 large sweet onion (Vidalia, Walla Walla, or other mild variety)
  • All-purpose flour (about 1 cup)
  • Cornstarch (2–3 tablespoons for extra crispness)
  • Eggs (2 large)
  • Buttermilk (about 1 cup; milk with a splash of lemon works too)
  • Panko breadcrumbs (optional but recommended, 1/2 cup)
  • Paprika (1 teaspoon)
  • Garlic powder (1 teaspoon)
  • Onion powder (1 teaspoon)
  • Cayenne pepper (1/4–1/2 teaspoon, to taste)
  • Salt and black pepper
  • Cooking oil spray (avocado or canola)
  • For the dipping sauce: mayonnaise, sour cream or Greek yogurt, ketchup, prepared horseradish, lemon juice, smoked paprika, salt, and pepper

Instructions

  • Prep the onion. Trim 1/2 inch off the top, leaving the root end intact to hold everything together. Peel the skin.
  • Make the “bloom.” Place the onion cut-side down. Starting 1/2 inch from the root, make 4 cuts down to the board to create quarters. Then cut each quarter into 2–3 sections, depending on onion size. Flip upright and gently separate the layers into “petals.”
  • Chill briefly. Pop the opened onion in the fridge for 10–15 minutes. This helps it hold shape for breading.
  • Mix the dry coating. In a bowl, combine 1 cup flour, 2 tablespoons cornstarch, 1 teaspoon paprika, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1/4–1/2 teaspoon cayenne, 1 teaspoon salt, and 1/2 teaspoon black pepper. Stir in 1/2 cup panko if using for extra crunch.
  • Make the wet mix. Whisk 2 eggs with 1 cup buttermilk until smooth. If using regular milk, add 1 teaspoon lemon juice and let sit 5 minutes before whisking with eggs.
  • Dust first. Lightly sprinkle some seasoned flour over and between the petals. Shake off excess. This first dusting helps the wet mix cling.
  • Dredge properly. Place the onion cut-side up over a bowl. Spoon the egg-buttermilk mixture over every petal, prying a bit to reach the inner layers. Let excess drip.
  • Coat generously. Spoon and press the dry coating all over and between the petals. Tip: Use one hand for wet, one for dry to keep clumps down. Aim for an even, slightly shaggy coating.
  • Set the crust. Let the coated onion rest 5 minutes. This helps the flour hydrate and stick.
  • Preheat the air fryer. Set to 360°F (182°C) for 5 minutes. A hot basket improves crisping.
  • Oil lightly. Spray the basket and the onion generously with cooking oil spray, especially the tips of the petals. Don’t soak—a fine, even mist is best.
  • Cook. Air fry at 360°F for 12–15 minutes. Check halfway, spray any floury spots, and rotate if your air fryer has hot spots.
  • Finish for color. Increase to 380–390°F for the last 3–5 minutes to deepen the golden brown color. The onion should be tender at the base and crisp on the edges.
  • Make the sauce. Stir together 1/3 cup mayo, 1/4 cup sour cream or Greek yogurt, 1 tablespoon ketchup, 1–2 teaspoons prepared horseradish, 1 teaspoon lemon juice, a pinch of smoked paprika, salt, and pepper. Adjust heat and tang to taste.
  • Serve. Transfer the blooming onion carefully with a spatula. Sprinkle with a pinch of salt and chopped parsley if you like. Serve hot with the dipping sauce.