Preparation: Preheat oven to 325˚F and adjust oven rack to center position. In a small bowl, mix together flour, baking soda, and salt; set aside. In a large bowl, melt the butter (I tend to use the microwave on very low power, but if you like, melt the butter in a small pan and pour it into the bowl.)
Add both brown and white sugar to the melted butter, and mix until thoroughly blended.
Beat in the egg and vanilla extract.
Finally, add in the dry ingredients and chocolate chips, and stir until the flour is completely incorporated and there are no white streaks.
Drop by tablespoons (I use a Norpro 1 Tbsp scoop) onto a parchment-lined baking sheet. Bake cookies, one sheet at a time, 15-18 minutes, until the edges are delicately browned. Transfer parchment with the cookies to a wire rack to cool completely.