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Heat the air fryer to 180C. Line the basket with baking parchment trimmed to fit. Put the cookies on the parchment, leaving a little space between them to expand as they cook. Sprinkle each cookie with a little flaky sea salt, if you like. Cook in batches for 7-8 mins, until golden at the edges but still soft in the middle – they’ll firm up as they cool. Leave in the air fryer for 2 mins, then transfer to a wire rack. Best eaten the same day. Will keep in an airtight container for up to three days.
