Preparation Time
- Preparation: 25 minutes
- Chilling Time: 15 minutes
- Air Frying Time: 18–22 minutes
- Total Time: Approximately 1 hour
Servings
- 4–6 servings
Ingredients
For the Onion
- 1 large sweet onion (about 450–600 g)
- 2 cups all-purpose flour
- 2 tablespoons cornstarch
- 1 tablespoon paprika
- 1 teaspoon garlic powder
- 1 teaspoon onion powder
- 1 teaspoon salt
- 1 teaspoon black pepper
- ½ teaspoon cayenne pepper (optional)
- ½ teaspoon dried oregano
- ½ teaspoon dried thyme
Wet Batter
- 2 large eggs
- 1 cup milk
- ¼ cup water
For Spraying
- Cooking oil spray
Dipping Sauce Ingredients
- ½ cup mayonnaise
- 2 tablespoons ketchup
- 1 tablespoon sour cream
- ½ teaspoon paprika
- ¼ teaspoon garlic powder
- ¼ teaspoon onion powder
- 1 teaspoon lemon juice
- Salt and pepper to taste
Selecting the Onion
Choose the largest sweet onion you can find. Large onions create more petals and produce a more dramatic bloom.
Good options include:
- Sweet onions
- Vidalia-style onions
- Mild yellow onions
The onion should feel firm and heavy for its size.
Step 1: Prepare the Onion
Peel the onion and trim off the stem end.
Leave the root end intact because it holds the onion together.
Place the onion root-side up.
Using a sharp knife:
- Cut from the top toward the root.
- Stop about 1 cm before reaching the root.
- Rotate and repeat.
Make:
- 4 sections
- Then 8 sections
- Then 16 sections
A large onion can have up to 20–24 petals.
Step 2: Open the Onion
Turn the onion over so the root is on the bottom.
Gently spread the petals apart using your fingers.
Work slowly to avoid breaking the layers.
The onion should resemble a flower.
Step 3: Make the Seasoned Coating
In a large bowl combine:
- Flour
- Cornstarch
- Paprika
- Garlic powder
- Onion powder
- Salt
- Black pepper
- Cayenne pepper
- Oregano
- Thyme
Whisk thoroughly.
The seasoning should be evenly distributed.
Step 4: Prepare the Batter
In another bowl whisk together:
- Eggs
- Milk
- Water
Whisk until completely smooth.
The mixture should be thin enough to flow between the onion petals.
Step 5: First Coating
Place the onion in a large bowl.
Sprinkle the flour mixture generously over every surface.
Carefully separate petals and coat between each layer.
Shake away excess flour.
This first coating helps the batter stick properly.
Step 6: Batter Coating
Dip the onion into the wet batter.
Use a spoon to pour batter into:
- The center
- Between petals
- Around the sides
Lift and allow excess batter to drip away.
Step 7: Second Coating
Return the onion to the flour mixture.
Coat every surface again.
Press flour gently onto the onion.
Pay special attention to the spaces between petals.
A thick coating creates maximum crispiness.
Step 8: Chill the Onion
Place the coated onion on a plate or tray.
Refrigerate for 15 minutes.
This helps the coating adhere during cooking.
Step 9: Prepare the Air Fryer
Preheat the air fryer to:
- 190°C (375°F)
Preheating helps the coating begin crisping immediately.
Step 10: Apply Oil Spray
Remove the onion from the refrigerator.
Spray generously with cooking oil.
Make sure oil reaches:
- The top
- The sides
- The center
- Between petals
Proper oil coverage is essential for browning.
Dry flour spots may remain pale if not sprayed.
Step 11: Air Fry the Onion
Place the onion in the air fryer basket.
Root side down.
Cook at:
- 190°C (375°F)
For:
- 10 minutes
Open the basket.
Spray lightly with more oil if needed.
Continue cooking for:
- 8–12 additional minutes
Total cooking time:
- 18–22 minutes
Depending on onion size and air fryer model.
How to Tell When It’s Ready
The blooming onion is done when:
- The coating is golden brown
- The petals are crispy
- The onion center is tender
- The outer layers feel crunchy
A knife should slide easily into the thickest part.
Step 12: Make the Dipping Sauce
Combine:
- Mayonnaise
- Ketchup
- Sour cream
- Paprika
- Garlic powder
- Onion powder
- Lemon juice
- Salt
- Pepper
Mix until smooth.
Refrigerate until serving.
Serving the Blooming Onion
Transfer the hot blooming onion to a serving platter.
Serve immediately with the dipping sauce.
The onion is at its crispiest during the first few minutes after cooking.
Extra Crispy Air Fryer Version
For additional crunch:
- Replace ½ cup flour with panko breadcrumbs.
- Spray thoroughly with oil.
- Cook for the full 22 minutes.
This creates a texture closer to restaurant-style blooming onions.
Spicy Version
Add to the flour mixture:
- 1 teaspoon cayenne pepper
- ½ teaspoon chili powder
- ½ teaspoon smoked paprika
Serve with a spicy dipping sauce.
Cheese Lover’s Version
Mix into the flour coating:
- ¼ cup grated Parmesan cheese
This adds extra flavor and helps create a rich golden crust.
Storage
Store leftovers in an airtight container in the refrigerator for up to 2 days.
Reheating
For best results:
- Air fryer: 180°C (350°F) for 4–6 minutes
- Oven: 200°C (400°F) for 8–10 minutes
Avoid microwaving because the coating will lose its crisp texture.
Tips for the Best Air Fryer Blooming Onion
- Use a large sweet onion.
- Keep the root intact.
- Separate the petals gently.
- Coat between every layer.
- Chill before cooking.
- Preheat the air fryer.
- Spray generously with oil.
- Do not overcrowd the basket.
- Serve immediately.
- Pair with a flavorful dipping sauce.
The result is a beautifully crisp, golden blooming onion with tender layers inside and far less oil than the traditional deep-fried version.
