unsalted butter, cool room temp • granulated sugar • large eggs, room temp • vanilla extract • all-purpose flour • unsweetened cocoa powder • baking powder • fine salt • cornstarch or rice flour (helps hold sharp lines) • granulated sugar (first coat) • powdered sugar (outer coat) • Note: With crinkles, heavy sugar coating softens surface detail a bit—that’s normal. These steps keep patterns as crisp as possible