Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a mixing bowl, whisk together the flour, cocoa powder, baking soda, and salt. Set aside.
In another bowl, cream the softened butter and granulated sugar using an electric mixer until light and fluffy, about 2-3 minutes.
Add the egg, red food coloring, and vanilla extract to the butter mixture. Beat until well combined.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. If desired, fold in the white chocolate chips.
Using a cookie scoop or spoon, drop tablespoon-sized portions of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake for about 10 minutes, or until the edges are set and the tops look slightly cracked.
Allow the cookies to cool on the baking sheet for 5 minutes, then transfer them to a cooling rack to cool completely.
For an extra festive touch, sprinkle powdered sugar on top before serving.
Store the cookies in an airtight container for up to a week.