Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.

In a large mixing bowl, combine softened butter, granulated sugar, and brown sugar. Beat until light and fluffy.

Add the egg and vanilla extract to the creamed mixture and mix until well combined.

Whisk together the all-purpose flour, baking powder, baking soda, and salt in a separate bowl. Gradually mix into the wet ingredients until no flour streaks remain.

Gently fold in the orange zest.

Drop spoonfuls of dough onto prepared baking sheets, spaced 2 inches apart.

Bake for 10-12 minutes until edges are golden brown. The centers should look slightly underbaked.

Cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.