Preheat your oven to 350 degrees F. Prepare your baking sheets by lining with parchment paper. Whisk together your flour, cocoa powder, baking powder, baking soda, and salt. Set aside.

Place your sugar and butter in a mixing bowl and beat until light and fluffy, no less than 3 minutes, scraping down the bowl as needed. Add in the eggs one at a time, adding the next only after the first has been fully combined. Add in the milk, the vanilla, and the food coloring and beat until combined. Add in the flour and mix until just moistened. Fold in the chocolate (you can use just white, just milk, or a combination like I did - just use whatever you have handy).

Place the powdered sugar in a bowl. Scoop 2-tablespoon sized mounds of dough out, roll them in the powdered sugar, and place 3-inches apart on your baking sheets. Bake for 11-13 minutes, until set but not browned. Allow to cool before moving to another surface. These cookies will keep well in an airtight container for up to 4 days.