Ingredients
Method
Preparation
- In a large bowl, use a mixer to beat the butter, granulated sugar, and brown sugar until fluffy and light in color, about 3 minutes.
- Add the egg and vanilla extract, then beat until well combined, scraping down the bowl as needed.
- In a separate bowl, whisk together the flour, cocoa powder, baking soda, and salt.
- With the mixer on low speed, gradually add the dry mixture to the wet ingredients until just combined.
- Switch to high speed and mix in the milk until the dough is thick and sticky.
- Cover the dough tightly and chill in the refrigerator for at least 2 hours, up to 3 days.
Baking
- Preheat oven to 350°F (177°C) and line baking sheets with parchment paper.
- Scoop and roll heaping tablespoons of dough into balls and roll in granulated sugar.
- Arrange them 2–3 inches apart on the prepared baking sheets.
- Bake for 10–12 minutes until edges set. If cookies aren't spreading by minute 9, gently bang the baking sheet on the counter 2–3 times.
- Let cookies cool for 2 minutes, then press an Andes mint into the top of each warm cookie and swirl the melted chocolate.
- Transfer cookies to a cooling rack to cool completely.
Notes
For extra flavor, add a pinch of espresso powder or mix in crushed mint candies. Store cookies in an airtight container at room temperature for up to a week, or freeze for up to three months.
