Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a bowl, whisk together flour, cocoa powder, baking soda, and salt.
In another bowl, cream butter, granulated sugar, and brown sugar until fluffy. Add egg, vanilla, milk, and red food coloring.
Gradually mix the dry ingredients into the wet mixture until combined. Fold in white chocolate chips.
Scoop dough balls onto the baking sheet, leaving 2 inches between each.
Bake for 10-12 minutes, or until edges are firm but centers are soft. Cool on a wire rack.