In a small bowl, whisk the melted butter and the sugar together.

Add in vanilla essence and egg yolk into the butter mixture and mix until the ingredients are well combined and creamy.

In another bowl, sift in the all purpose flour and baking soda.

Whisk both ingredients well and then pour the flour mixture over the wet ingredients.

Mix and fold the ingredients until all the ingredients are thoroughly combined.

Scoop the dough into small portions, depending on how many cookies you want [I make 5 cookies]. Since the dough will spread a lot, try to leave at least 3 inches between each scoop of the dough.

Bake for about 12-16 minutes.

Cool it on the rack for about 10-15 minutes.

Serve and enjoy!