In a large bowl, cream together the softened butter, egg, and vanilla extract until well blended.
In a separate bowl, whisk together the flour, baking soda, salt, granulated sugar, and brown sugar.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Stir in the chocolate chips.
Drop by rounded tablespoons onto ungreased baking sheets.
Bake for 9-11 minutes, or until golden brown.
Let the cookies cool on the baking sheets for a couple of minutes before transferring them to a wire rack to cool completely.
Notes
This mix makes a great gift! Just layer the dry ingredients in a jar, and include a tag with the wet ingredients needed and baking instructions. For a fudgier cookie, bake for slightly less time.