Cream together softened butter, light brown sugar, and granulated sugar
Mix in egg yolk and vanilla extract
In a separate bowl, combine plain flour, bicarbonate of soda, and salt
Fold dry ingredients into wet ingredients
Stir in chocolate chips
Divide mixture into 2 large or 4 small ramekins
Air fry at appropriate temperature for 10 minutes until soft and gooey
Alternatively, bake in oven at 200C (180C fan) for 12-13 minutes
