Preheat oven to 350. Line two cookie sheets with parchment paper.
In a large bowl, mix the butter and sugars.
Add the egg, vanilla, and orange zest 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.
Using a medium cookie scoop drop balls of dough on the prepared trays.
Optional: Roll each dough ball lightly in the sugar before placing it on the baking sheet.
Bake for 12 minutes or until barely set. The center should still be a bit shiny.