recipe from joythebaker.com

1/3 cup all-purpose flour

3 tablespoons unsweetened cocoa powder

¼ teaspoon salt

5 ounces bittersweet chocolate,

4 ounces coarsely chopped,

1 ounce very finely chopped

1 stick (8 tablespoons) unsalted butter, cut into 8 pieces

2 large eggs, at room temperature

1 large egg yolk, at room temperature

6 tablespoons of sugar

Getting ready: Center a rack in the oven and preheat the oven to 400 degrees F. butter (or spray – it’s easier) 6 cups of a regular-size muffin pan, preferably a disposable aluminum foil pan, dust the insides with flour and tap out the excess. Put the muffin pan on a baking sheet.

      Sift the flour, cocoa and salt together.

      Set a heatproof bowl over a saucepan of gently simmering water, put the coarsely chopped chocolate and the butter in the bowl and stir occasionally over the simmering water just until they are melted – you don’t want them to get so hot that the butter separates.  Remove the bowl from the pan of water.

      In a large bowl, whisk the eggs and yolk until homogenous.  Add the sugar and whisk until well blended, about 2 minutes.  Add the dry ingredients and, still using the whisk, stir (don’t beat) them into the eggs.  Little by little, and using a light hand, stir in the melted chocolate and butter.  Divide the batter evenly among the muffin cups and sprinkle the finely chopped chocolate over the batter.