Preheat oven to 350. Line two cookie sheets with parchment paper.
In a large bowl, mix the butter and sugars.
Add the egg and vanilla and mix well.
Add the flour, baking powder, baking soda, and salt on top of the butter. Give them a little mix. (This saves the step of mixing them in a separate bowl).
Now, mix the dry ingredients in just until they are incorporated. Stop as soon as they are mixed in.
Stir in the chocolate chips.
Using a medium cookie scoop drop balls of dough on the prepared trays.
Bake for 10-12 minutes or until barely set. The center should still be a bit shiny.