Cut the tops off the onions and peel them, keeping the root intact.
Slice into sections to create petals without cutting through the root.
Gently separate the layers.
Mix milk and egg in a bowl.
Combine flour, spices, salt, and pepper in another bowl.
Dip onions in the milk mixture, then coat with flour mixture.
Preheat air fryer to 350°F.
Drizzle onions with oil and spray lightly.
Place onions in the basket.
Cook for 10 minutes, rotating halfway, until golden.
Melt butter in a saucepan.
Add flour and cook for 1 minute.
Gradually add milk and stir until thickened.
Add apple cider and cook briefly.
Remove from heat and stir in cheeses and mustard until smooth.
Serve onions with warm sauce.
Notes & Wine Advice
Notes
Keep the root intact to hold the onion together during cooking. Make even cuts to ensure proper blooming. Do not overcrowd the air fryer for best results.
Serve Tip
Serve immediately while hot so the petals stay crispy. Place the sauce in the center or on the side for dipping.
Variations
Use white or yellow onions for a milder flavor. Add smoked paprika for extra depth. Make the sauce spicier with chili flakes or hot sauce.
Wine Advice
A fresh Chardonnay pairs nicely with the creamy cheese sauce. A slightly sweet Riesling balances the savory and tangy flavors perfectly.