01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper for easy cleanup and to prevent sticking.
02 - In a medium bowl, whisk together the all-purpose flour, cocoa powder, baking soda, and salt until thoroughly 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 well after each addition. Mix in the milk, vanilla extract, white vinegar, and green food coloring until fully combined and the color is uniform.
05 - Gradually add the dry ingredient mixture to the wet ingredients, mixing just until combined. Avoid overmixing to prevent tough cookies.
06 - Fold in the white chocolate chips by hand using a spatula, ensuring even distribution throughout the dough.
07 - Drop tablespoon-sized balls of dough onto the prepared baking sheets, spacing them approximately 2 inches apart to allow for spreading during baking.
08 - Bake for 10-12 minutes, or until the edges are set but the centers remain slightly soft. Remove from oven when the tops appear matte rather than glossy.
09 - Let the cookies rest on the baking sheet for 5 minutes to firm up slightly, then transfer to a wire rack to cool completely before serving or storing.