01 - Preheat the oven to 350°F and line two baking sheets with parchment paper.
02 - Whisk together the flour, cocoa powder, baking soda, and salt in a medium bowl. Set aside.
03 - Beat the butter, granulated sugar, and brown sugar in a large bowl until light and fluffy.
04 - Add eggs one at a time, beating well after each. Mix in milk, vanilla extract, vinegar, and green food coloring until fully combined.
05 - Gradually add dry ingredients to wet ingredients, mixing just until combined.
06 - Fold in the white chocolate chips until evenly distributed throughout the dough.
07 - Scoop tablespoon-sized balls of dough onto prepared baking sheets, spacing about 2 inches apart.
08 - Bake for 10 to 12 minutes until edges are set but centers remain soft.
09 - Let cookies cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.