Preheat the oven to 350° F. Line you baking sheet with parchment paper or a silicone baking mat. Set aside.
In the bowl of a stand mixer or with an electric hand mixer, cream together the butter and sugar until well combined.
Scrape the sides of the bowl and add in the egg yolk, corn syrup and vanilla. Mix until combined.
Add the flour, baking soda and salt, mix until the dough forms.
Divide the dough into 6 equal sized portions and roll into balls.
Bake at 350° F for 7-9 minutes or until the center of the cookies no longer look wet and glossy.
Allow the cookies to cool on the pan.
Store in an airtight container for up to 3 days.