1. Preheat the oven to 350°F and line baking sheets with parchment paper.

2. In a large mixing bowl, beat the softened butter and granulated sugar until light and fluffy.

3. Add the eggs one at a time, mixing well after each addition, then mix in the vanilla extract.

4. In a separate bowl, whisk together the flour, baking powder, and salt.

5. Gradually add the dry ingredients to the wet mixture and mix until a soft dough forms.

6. Divide the dough evenly into two bowls. Tint one bowl red and the other green, mixing until the color is fully blended.

7. Cover and chill the dough for 1 to 2 hours until firm enough to scoop.

8. Scoop the dough into tablespoon-sized balls and roll each one generously in powdered sugar.

9. Place the dough balls on the prepared baking sheets about 2 inches apart.

10. Bake for 10 to 12 minutes, or until the cookies are puffed and crackled on top.

11. Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.