01 - Whisk together flour, cocoa powder, baking powder, and salt in a medium bowl. Set aside for later use.
02 - Whisk melted butter and granulated 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 prevent tough cookies.
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.
06 - Place powdered sugar in a shallow bowl. Scoop chilled dough by tablespoonfuls, roll into 1-inch balls, and generously coat each ball in powdered sugar until completely covered.
07 - Place coated dough balls 2 inches apart on prepared baking sheets, allowing space for spreading during baking.
08 - Bake for 11 to 13 minutes until cookies are puffed and surfaces show characteristic crackling. Centers should remain soft when gently touched.
09 - Let cookies rest on baking sheets for 5 minutes to set. Transfer to a wire rack and cool completely before storing or serving.