1-First Step: Cream the butter and sugars. Start by beating the 1/2 cup unsalted butter, 1/2 cup granulated sugar, and 1/2 cup packed brown sugar together until the mixture looks light and fluffy. This usually takes about 3 minutes. This step matters because it helps build a soft texture and gives the cookies a better rise in the oven. Use a large mixing bowl and a hand mixer or stand mixer. Scrape down the sides of the bowl as needed so everything blends evenly. If the butter is too cold, let it sit at room temperature for a bit first. Soft butter mixes much better and gives you a smoother dough.

2-Second Step: Add the egg and vanilla. Next, add 1 large room temperature egg and 1 teaspoon vanilla extract. Beat until everything is combined and the mixture looks smooth. Scrape the sides of the bowl again so no streaks of butter or sugar stay behind. Room temperature egg is helpful because it mixes more easily into the butter mixture. That means you get a more even dough with less effort. The vanilla adds warmth and helps the chocolate flavor taste fuller.

3-Third Step: Mix the dry ingredients. In a separate bowl, whisk together 1 and 1/4 cups all-purpose flour, 1/2 cup natural unsweetened cocoa powder, 1 teaspoon baking soda, and 1/8 teaspoon salt. Whisking helps break up cocoa lumps and spreads the leavening evenly through the flour. This dry mix gives the cookies their structure and chocolate flavor. Using natural cocoa powder gives the cookies a bold, familiar chocolate taste that pairs really well with mint. If you want a deeper flavor, do not skip the salt, even though it is a small amount.

4-Fourth Step: Bring the dough together. Gradually add the dry ingredients into the wet ingredients on low speed. Once the flour mixture starts to disappear, increase the speed and beat in 2 teaspoons milk. The dough should come together nicely and feel soft but not sticky. If the dough looks crumbly at first, keep mixing a little longer. The milk helps bring everything together without making the dough too wet. Stop mixing once you no longer see dry flour.

5-Fifth Step: Chill the dough. Cover the dough tightly and chill it in the refrigerator for at least 2 hours, or up to 3 days. This is one of the most important parts of the recipe. Chilling helps the dough firm up, makes scooping easier, and keeps the cookies from spreading too much in the oven. Cold dough makes better cookies. If you skip the chill time, the cookies may flatten and lose that soft, chewy bite. If you want to save time later, you can also portion the dough into balls before chilling. That way, baking day becomes quicker and easier.

6-Sixth Step: Prep the oven and baking sheets. When you are ready to bake, preheat the oven to 350°F (177°C). Line baking sheets with parchment paper so the cookies lift off easily after baking. Parchment also helps keep the bottoms from overbrowning. While the oven heats, place your granulated sugar for coating in a small bowl. This makes the next step faster and less messy. If you are baking more than one tray, keep the second tray ready to go.

7-Seventh Step: Shape and coat the dough. Scoop 1 heaping tablespoon of dough, about 25g, and roll each portion into a smooth ball. Then coat each dough ball thoroughly in the reserved granulated sugar. Place the balls 2 to 3 inches apart on the lined baking sheet. Rolling well in sugar gives the cookies a pretty finish and a light crunch on the outside. It also helps the cookies look more polished once baked. If your dough feels sticky, let it sit for a few minutes after chilling before shaping.

8-Eighth Step: Bake until the edges are set. Bake the cookies for 10 to 12 minutes, or until the edges look set. The centers may still look soft, and that is exactly what you want. If the cookies do not spread by the 9-minute mark, remove the pan and bang it on the counter 2 to 3 times, then return it to the oven. That quick tap can help encourage spreading, especially if the dough is still a bit cold. Watch closely near the end of baking so you do not overbake them. These cookies are at their best when they stay soft in the center.

9-Ninth Step: Add the chocolate mints. Let the cookies cool on the baking sheet for 2 minutes. Then press one unwrapped chocolate mint into the center of each warm cookie. Be gentle so the chocolate does not slide off the top. Let the cookies stand for about 5 minutes so the chocolate softens. Once it is soft, use a knife or spatula to swirl the melted chocolate across the top. That gives the cookies their classic mint chocolate look.

10-Tenth Step: Cool completely and serve. Transfer the cookies to a cooling rack and let them cool fully. The chocolate mints will set matte in under an hour. Once set, the cookies are ready to eat, share, pack in lunch boxes, or add to holiday dessert trays. For more baking ideas, you may also enjoy my holiday cookie recipes and my chocolate mint dessert ideas.