Slice onions into rings and stuff each ring with cheddar cheese.
Prepare a coating mixture with wheat flour, cornstarch, baking powder, salt, and tonic water.
Dip stuffed onion rings in the coating mixture, then coat with breadcrumbs.
Air fry at 200°C for 15 minutes until crispy and golden brown.
Serve and enjoy the cheesy, crispy, and flavorful stuffed onion rings.
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