01 - Whisk together flour, cocoa powder, baking powder, and salt in a medium bowl. Set aside for later use.
02 - Whisk melted butter and sugar in a large bowl until well combined. Add eggs one at a time, beating thoroughly after each addition. Stir in vanilla extract, vinegar, and red food coloring until fully incorporated.
03 - Gradually add dry ingredients to the wet mixture, alternating with buttermilk. Begin and end with dry ingredients. Mix until just combined—avoid overmixing to maintain tender texture.
04 - Cover the dough and refrigerate for at least 2 hours or until firm enough to handle. This step is essential for proper cookie shape and texture.
05 - Preheat oven to 350°F. Line two baking sheets with parchment paper to prevent sticking and ensure even baking.
06 - Place powdered sugar in a shallow bowl. Scoop chilled dough by tablespoonfuls, roll into smooth balls, and generously coat each ball in powdered sugar until thoroughly covered.
07 - Arrange coated cookies 2 inches apart on prepared baking sheets. Bake for 11 to 13 minutes until cookies are puffed and show characteristic crackling but remain soft in the center.
08 - Let cookies rest on baking sheet for 5 minutes to set before transferring to a wire rack. Cool completely before storing to preserve texture.