Sift together the flour, baking soda, and salt in a bowl; set aside.
In my mixer bowl I, creamed together the melted butter and brown and granulated sugars until well blended.
Beat in the vanilla, egg, and egg yolk, mixing until light and creamy.
Mix in the sifted ingredients, working until just blended.
Stir in the chocolate chips and oats by hand, I used a spatula because I always use spatulas for everything.
Chill dough in the refrigerator for 30 minutes to one hour.
Preheat the oven to 325 degrees. Line them with parchment paper, I don’t really like parchment because it folds funny and it makes me feel silly but I dislike cleaning so I use it.
Use a table knife to scoop and press dough into a ¼-cup measuring scoop, and put the dough balls onto the prepared cookie sheets.
You don’t want the cookies too close together.
Bake cookies for 15 to 20 minutes, or until the edges are lightly browned.
Cool on baking sheets for a few minutes before transferring to wire racks to cook completely.
I’d recommend eating with milk.