Ingredients
Method
- Preheat oven to 350°F (180°C). Whisk butter, sugar, egg, egg yolk, and vanilla until glossy.
- Stir in cocoa powder, flour, and salt just until no dry streaks remain.
- Grease a 24-cup mini muffin pan and fill each cup about three-quarters full.
- Bake for 10 to 12 minutes until edges are set and a toothpick shows moist crumbs.
- Cool in the pan for 5 minutes, then loosen edges and turn out onto a rack. Serve warm or at room temperature.
Notes
Pull the pan from the oven when a toothpick shows a few moist crumbs; the bites will finish setting as they cool. For the fudgiest centers, serve them while they’re still slightly warm.
