2tspmilk or buttermilkbuttermilk preferred; whole milk works
1 1/2tspvanilla extractpure
1/2–3/4tspred gel food coloringadd to desired color
3/4cupwhite chocolate chips
1–2tbspValentine sprinklesoptional, for tops
Instructions
In a medium bowl, whisk together the flour, cocoa powder, baking soda, and salt until evenly combined and no streaks remain.
In a large bowl, beat the softened butter, brown sugar, and granulated sugar with a hand mixer (or stand mixer with paddle) on medium to medium-high until lighter and fluffy, about 3 minutes, scraping the bowl halfway through.
Add the egg and vanilla extract and beat on medium-high just until combined and creamy (about 45–60 seconds), avoiding overbeating.
Reduce mixer speed to low. Mix in about half the dry ingredients, then add the milk/buttermilk and red food coloring. Add the remaining dry ingredients and stop mixing as soon as a soft dough forms.
Fold in the white chocolate chips on low speed or by hand just until evenly distributed.
Cover and refrigerate the dough until firm, about 60–90 minutes (if chilled longer, let it sit at room temperature 10–15 minutes to make scooping easier).
Preheat the oven to 350°F (177°C). Line two baking sheets with parchment paper or silicone mats.
Scoop the dough into portions (about 1 1/2 tablespoons each for 12–14 cookies) and place on the prepared sheets, spacing cookies about 3 inches apart.
Bake one sheet at a time until edges look set and centers are still soft, about 11–13 minutes (add 1–2 minutes for larger scoops).
While warm, press a few extra chips into the tops and add sprinkles if using. Cool on the baking sheet for 5 minutes, then transfer to a rack to cool completely.