01 - Whisk together flour, cocoa powder, baking powder, and salt in a medium bowl until thoroughly combined. Set aside for later use.
02 - In a large bowl, whisk melted butter and granulated sugar until smooth and well incorporated. Add eggs one at a time, beating thoroughly after each addition. Stir in vanilla extract, white vinegar, and red food coloring until evenly distributed.
03 - Gradually incorporate dry ingredients into the wet mixture, alternating with buttermilk. Begin and end with dry ingredients, mixing gently until just combined. Avoid overmixing to prevent tough cookies.
04 - Cover bowl with plastic wrap or lid. Refrigerate dough for at least 2 hours or until firm enough to handle. Chilled dough prevents excessive spreading during baking.
05 - Preheat oven to 350°F. Line two baking sheets with parchment paper to prevent sticking and ensure easy cleanup.
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, ensuring complete coverage for the crackled effect.
07 - Place sugar-coated dough balls 2 inches apart on prepared baking sheets to allow room for spreading.
08 - Bake for 11 to 13 minutes until cookies are puffed and surface shows crackled appearance. Centers should remain soft when touched.
09 - Let cookies rest on baking sheet for 5 minutes to set. Transfer to wire rack and cool completely before storing or serving.