Add butter, brown sugar, white sugar, egg, egg yolk, vanilla into a bowl and mix

On a separate bowl sift flour, baking soda, salt and mix

Combine the dry ingredients little by little into other mixture until a thick paste is formed

Place the cookie dough in a baking sheet with baking paper, make sure the cookies are at least 1.5 inches apart

Bake on 350F for 7-10mins, take out when the cookies get light brown edges, take them out and let them cool

If the mix is too much, roll the cookie dough in balls and place in the freezer until frozen then put them in a plastic bag, whenever you want to bake them, take them
out of the freezer and keep out until the balls are in room temperature, then bake as usual