01 - 
                Whisk together cake flour, all-purpose flour, cornstarch, baking soda, and sea salt in a large bowl until uniformly blended.
              
              
              
                02 - 
                Place white chocolate chips in a medium bowl and Halloween sprinkles in a separate small bowl; set both aside within easy reach.
              
              
              
                03 - 
                Beat cubed cold butter and granulated sugar with a stand mixer on high speed for 2–3 minutes until light and fluffy, forming a smooth base.
              
              
              
                04 - 
                Add eggs one at a time, fully incorporating each before the next to avoid batter splitting and ensure even texture.
              
              
              
                05 - 
                Mix in vanilla extract and continue beating for an additional minute to enhance flavor depth.
              
              
              
                06 - 
                On medium mixer speed, gradually add dry ingredients to wet mixture, mixing just until flour streaks disappear to maintain softness.
              
              
              
                07 - 
                Cover dough and refrigerate for 30 minutes to firm up, promoting thicker, chewier cookies.
              
              
              
                08 - 
                Preheat oven to 215°C (420°F). Line two baking sheets with parchment paper or silicone mats to prevent sticking and ensure even baking.
              
              
              
                09 - 
                Divide chilled dough equally into three bowls. Add one neon gel food coloring to each and knead until color is evenly distributed and vibrant.
              
              
              
                10 - 
                Pinch a tablespoon-sized portion from each colored dough, roll each into a ball, press together gently, and roll the combined mass into one large dough ball creating distinct swirls.
              
              
              
                11 - 
                Roll each multi-hued dough ball first in white chocolate chips so they adhere well, then roll the edges in Halloween sprinkles for decorative effect.
              
              
              
                12 - 
                Gently press each coated dough ball into a thick disk. Place on prepared baking sheets spaced 5 cm (2 inches) apart to allow proper rising and spreading.
              
              
              
                13 - 
                Bake individually for 12 to 14 minutes, monitoring closely until edges turn golden while centers remain soft and pillowy.
              
              
              
                14 - 
                Allow cookies to cool briefly on the baking sheet to set their shape, then transfer to a wire rack to cool completely preserving chewiness.