1-First, grab a big bowl and beat the butter, granulated sugar, and brown sugar together until they’re fluffy and light, which takes about 3 minutes. This step is key for that soft texture, so don’t skip the mixing! Next, add the egg and vanilla extract, beating until everything is nicely combined it’s like giving your dough a flavorful hug.

2-In a separate bowl, whisk together the flour, cocoa powder, baking soda, and salt to make sure all those dry ingredients play nice. Slowly mix this into your wet mixture on low speed, then crank it up to high and add the milk until the dough gets thick and sticky. At this point, cover it up and pop it in the fridge for at least 2 hours trust me, this chill time is a game-changer for handling the dough without it sticking everywhere.

3-Preheat and Shape the Dough: Once your dough has chilled, preheat your oven to 350°F and line your baking sheets with parchment paper. This makes cleanup a breeze and ensures your cookies slide right off. Scoop out 1 heaping tablespoon of dough about 25 grams each roll it into balls, and then roll those balls in the granulated sugar for that extra sparkle and crunch.

4-Place the dough balls on your sheets, spacing them 2 to 3 inches apart so they have room to spread. Pop them in the oven and bake for 10 to 12 minutes until the edges look set. If they haven’t spread by 9 minutes, give the sheet a gentle tap on the counter a couple of times to help them along it’s a neat trick I picked up after a few baking fails!

5-Finishing Touches: After baking, let the cookies cool on the sheet for 2 minutes, then press one chocolate mint into the center of each. Let it sit for 5 minutes so the mint melts a bit, and swirl it gently with a knife for that creamy finish. Transfer them to a rack to cool completely; they’ll deflate a little, which is totally normal and makes them even more irresistible.