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, granulated sugar, and brown sugar together in a large bowl until light and fluffy.
04 - Add eggs one at a time, beating well after each addition. 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 white chocolate chips until evenly distributed throughout the dough.
07 - Scoop tablespoon-sized dough balls onto prepared baking sheets, spacing about 2 inches apart.
08 - Bake for 10-12 minutes until edges are set but centers remain soft.
09 - Let cookies rest on baking sheet for 5 minutes, then transfer to wire rack to cool completely.