01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, baking powder, and salt in a medium bowl. Set aside.
03 - Beat butter and granulated sugar in a large bowl until light and fluffy, about 2 to 3 minutes.
04 - Add egg and vanilla extract to the butter mixture and mix until fully combined.
05 - Blend in the orange, lemon, and lime zest along with the fresh orange and lemon juices.
06 - Gradually fold the dry ingredient mixture into the wet ingredients just until incorporated.
07 - Scoop tablespoon-sized portions of dough onto prepared baking sheets, spacing them 2 inches apart.
08 - Bake for 10 to 12 minutes, or until edges are lightly golden.
09 - Allow cookies to cool on baking sheets for 5 minutes, then transfer to a wire rack to cool completely.
10 - Dust cookies with confectioners sugar before serving if desired.