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