In a medium mixing bowl, whisk together the flour, baking powder, and salt. Set aside.

In a large mixing bowl, combine the granulated sugar and melted butter. Mix until well combined. Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Fold in the mashed ube until evenly distributed throughout the dough.

Cover the dough with plastic wrap and refrigerate for at least 2 hours or overnight. Chilling the dough makes it easier to handle and creates a better texture.

Preheat the oven to 350°F. Line a baking sheet with parchment paper.

Place the powdered sugar in a small bowl.

Scoop out tablespoon-sized portions of the chilled dough and roll them into balls.

Roll each ball in the powdered sugar until fully coated and place on the prepared baking sheet, spacing the balls about 2 inches apart.

Bake for 10 to 12 minutes or until the cookies are cracked on top and set around the edges but are still slightly soft in the center.

Remove the cookies from the oven and allow them to cool on the baking sheet for 5 minutes. Then transfer them to a wire rack to cool completely.

Enjoy immediately or store in an airtight container.