Melt your unsalted butter and add in both the light brown and granulated sugars.
Whisk together for two minutes until the sugar has dissolved.
Add the egg and the vanilla extract and mix well again.
Add the plain flour, bicarbonate of soda, sea salt, cornflour, all chocolate chips and mix well until it comes together to form a lovely thick cookie dough.
Divide the mixture evenly into 2 creme brûlée dishes - but if you don't have any then you can use small foil trays instead!
Place the cookie dough in the oven for 12-15 minutes, or until golden on top and just cooked through in the middle - the gooier the better!
Remove from the oven and let it cool for a couple of minutes and then serve with a giant dollop of ice cream!
Notes
You could swap out the chocolate for all white chocolate, all milk chocolate etc - whatever you fancy!
I'm not sure about the rest of the world, but in the UK at Pizza Hut you can buy cookie dough desserts - this is very similar to that! And you can make it at home yourself!