Add the butter to a bowl with the sugar and mix together until combined
Add the egg and the vanilla extract and mix well again.
Add the flour, bicarbonate, cocoa powder and chocolate chips and mix well until it comes together to form a lovely thick cookie dough..
Divide the mixture into 4 ramekins - mine are about 9cm in size.
Place the ramekins into the air fryer basket and bake on the air fry mode for 12-14 minutes at 160ºc - you can do this in batches if they don't all fit.
Remove from the air fryer and let it cool for a couple of minutes and then serve with a giant dollop of ice cream!