4ouncessemi-sweet chocolate, cut into small pieces
½cupsemi-sweet or bittersweet chocolate chips
¾cuphazelnuts, pecans, almonds, or walnuts, toasted and chopped (optional)
Preheat the oven to 350 degrees. Line an 8-inch square baking dish with foil and spray lightly with nonstick cooking spray; set aside.
Melt the butter in a medium saucepan. Add the chocolate pieces and stir constantly with a whisk over very low heat until the chocolate is melted. Remove from the heat and stir in the sugar, eggs, and the vanilla. Then stir in the flour and salt. Beat the batter vigorously for 30 seconds. Stir in the chocolate chips and nuts, if using.
Pour the batter into the prepared pan, smooth the top, and bake for 30 minutes, or until the center feels just about set. Remove from the oven and let cool.
Recipe barely adapted from The Perfect Scoop by David Lebovitz