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 softened butter and granulated sugar in a large bowl until light and fluffy.
04 - Beat in eggs one at a time, then add vanilla extract. Mix until well incorporated.
05 - Add flour mixture to wet ingredients in two parts, alternating with milk. Mix until just combined.
06 - Divide dough evenly into 3 or 4 bowls. Tint each portion with gel food coloring, mixing gently to achieve pastel shades.
07 - Refrigerate dough for 20 minutes if it feels too soft to handle.
08 - Scoop tablespoon-sized balls of dough. Roll in powdered sugar until well coated and place 2 inches apart on prepared baking sheets.
09 - Bake for 10-12 minutes, or until edges are set and tops are crackled but still soft in the center.
10 - Let cookies cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.