01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper to prevent sticking.
02 - In a medium bowl, whisk together the flour, cocoa powder, baking soda, and salt until well blended. Set aside for later use.
03 - In a large bowl, beat the softened butter, granulated sugar, and brown sugar together until the mixture becomes light and fluffy, approximately 2-3 minutes.
04 - Add the eggs one at a time, beating thoroughly after each addition. Incorporate the milk, vanilla extract, vinegar, and green food coloring, mixing until the batter is uniformly colored and smooth.
05 - Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed just until combined. Avoid overmixing to prevent tough cookies.
06 - Gently fold the white chocolate chips into the dough using a spatula until evenly distributed throughout.
07 - Scoop tablespoon-sized balls of dough onto the prepared baking sheets, leaving approximately 2 inches of space between each cookie to allow for spreading.
08 - Bake for 10-12 minutes, or until the edges appear set while the centers remain slightly soft. The cookies should not appear overbaked.
09 - Allow the cookies to rest on the baking sheet for 5 minutes to firm up before transferring to a wire rack to cool completely.