Preheat oven to 350*.

Mix flour, baking soda, salt in a bowl.

In a separate larger bowl, combine sugars and butter. Then add egg, egg yolk, and vanilla.

Slowly add flour mixture to wet mixture.

Form dough balls and place on greased baking sheet (I spray mine with coconut oil spray).

Bake cookies until edges are done, around 10-13 minutes (check often!).