Caramelized onions, Gruyère cheese ... and create an indention (about 1/2-inch deep). Preheat a 6-quart air fryer to 400°F for 5 minutes. Sprinkle patties evenly with remaining 1 teaspoon ...
These can be baked in the oven or made in an air fryer – either way they’re healthier than traditional deep-fried onion rings. Preheat the oven to 200C/180C Fan/Gas 6, or the air fryer to 180C.
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