Photo: Iain Bagwell; Styling: Kristen Shelton Fielder
4 ounces bittersweet chocolate, chopped
3/4 cup butter, cut into pieces
1 cup sugar
3 large eggs
2 teaspoons vanilla extract
1 cup all-purpose flour
1/3 cup cocoa powder
1/4 teaspoon salt
1 cup semisweet chocolate chunks
3/4 cup walnuts, coarsely chopped (optional)
Garnish: powdered sugar
How to Make It
Preheat oven to 350°. Line an 8-inch square baking pan with parchment paper or nonstick aluminum foil.
Melt chocolate and butter in a large saucepan over very low heat. Stir in sugar, eggs, and vanilla. Combine flour and next 2 ingredients; stir into chocolate mixture. Fold in chocolate chunks and nuts, if desired. Spoon batter into prepared pan.
Bake 20 to 22 minutes or until toothpick inserted in center comes out with moist crumbs clinging. Cool completely in pan on wire rack. Cover and chill until firm.