1. Whisk together flour, cocoa powder, baking powder, and salt in a bowl and set aside.

2. Beat softened butter, granulated sugar, and brown sugar until light and fluffy, about 2–3 minutes.

3. Add eggs one at a time, then mix in vanilla extract, buttermilk, and red food coloring until evenly combined.

4. Gradually add the dry ingredients to the wet mixture in two batches, mixing on low speed just until combined.

5. Cover the dough and refrigerate for at least 2 hours to firm up and develop flavor.

6. Preheat oven to 350°F (175°C) and line baking sheets with parchment paper or silicone mats.

7. Place powdered sugar in a shallow bowl, scoop one tablespoon of chilled dough, and roll into a ball.

8. Coat each dough ball generously in powdered sugar and place 2 inches apart on the prepared baking sheets.

9. Bake for 10–12 minutes until the tops are cracked and centers are slightly soft, then cool on the baking sheet for 5 minutes before transferring to a wire rack.