Add the tablespoons of spread to a lined plate/tray and freeze until solid
Line a small baking tray with parchment paper
Mix together the butter and sugar
Add the egg yolk and vanilla and mix
Add the flour, cocoa powder, baking powder and salt and mix again
Mix through the chocolate chips
Split the dough into two - about 125g each
Carefully press the dough into the palm of your hand and place the frozen spread in the middle and wrap the cookie dough around firmly
Place onto the tray and chill in the fridge for about an hour
Preheat the oven to 200ºc/180ºc fan
Bake for 12-14 minutes
Notes
This recipe is designed to serve two cookies in the New York style
If you want to make four stuffed cookies, that are slightly smaller, weigh each cookie to 60g and stuffed with one heaped teaspoon of frozen spread, and bake for 8-9 minutes
The chilling stage of the cookie dough helps create the texture you are after
You can use any combination of chocolate chips you want