01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, cocoa powder, baking soda, and salt in a medium bowl. Set aside.
03 - Beat butter, oil, granulated sugar, and brown sugar in a large bowl until light and creamy, about 2 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in vanilla extract, red food coloring, and vinegar until fully combined.
05 - Gradually mix in dry ingredients until just combined. Avoid overmixing.
06 - Stir in white chocolate chips until evenly distributed.
07 - Scoop dough (about 2 tablespoons per cookie) onto prepared baking sheets, spacing 2 inches apart.
08 - Bake for 11–13 minutes until edges are set and centers appear slightly soft.
09 - Let cookies cool on baking sheet for 5 minutes before transferring to wire rack to cool completely.