Ingredients
Method
- Preheat oven to 350°F (175°C) and line two baking sheets with parchment. Whisk melted butter and both sugars until glossy, then whisk in egg, yolk, vanilla, and milk until smooth.
- Sift in cocoa, flour, baking powder, and salt, then stir with a spatula until just combined.
- Fold in the chocolate chips until evenly mixed.
- Scoop heaping tablespoons of dough onto sheets, spacing 2 inches apart. Bake 10 minutes until tops are crackly and edges set. Cool on sheets 5 minutes, then transfer to a rack.
Notes
Underbaking is key—the centers should look slightly wet when you pull them from the oven. They will finish setting as they cool. If your kitchen is warm, a 10-minute dough chill makes scooping easier. Store baked cookies in an airtight container at room temperature for up to 3 days, or freeze for up to 2 months.
