Preheat the oven to 350°F and line a baking sheet with parchment paper.
In a small mixing bowl combine the softened butter and the sugars and mix well. Add the egg yolk and vanilla extract and mix until smooth
Add the flour, salt, and baking soda. Mix until combined. Last, fold in the chocolate chips.
Shape into 2 medium-large cookies
Bake for 11 minutes or until the edges are just golden brown.