Chocolate Crinkle Cookies

1. Preheat oven to 350 F. Grease 2 baking sheets with butter or line it with a sheet of parchment paper.
2. Put the powdered sugar into a bowl and set aside.
3. In a medium bowl, using a wooden spoon, stir together the flour, cocoa powder, baking powder, and salt. Set aside.
4. In a large bowl, using an electric mixer, beat the butter and sugar until creamy, about 3 minutes.
5. Turn off the mixer and scrape down the sides of the bowl. Add 1 egg and beat on medium speed until blended. Add the other egg and vanilla and beat until blended.
6. Turn off the mixer and add the flour mixture. Beat on low speed until just blended.
7. Using a tablespoon, scoop up a rounded spoonful of dough.
8. Roll dough into a ball using your hands and roll the ball in the powdered sugar until covered.
9. Place the balls on the prepared baking sheet, spacing the balls 1-2 inches apart.
10. Bake until the cookies are cracked and puffed, about 10-12 minutes.
11. Remove the baking sheets from the oven and let cookies cool on the baking sheet for 15 minutes.
12. Using a spatula, move the cookies onto a cooling rack and let them cool completely.