Here's the recipe from the article in Cook's Illustrated. I haven't tried it, cause if I made them I would eat them! The author uses semisweet rather than bittersweet chocolate. The picture shows a very shiny top on these.

Super-Fudgy Triple Chocolate Brownies

Either Dutch-processed or natural cocoa wors well in this recipe. these brownies are very rich, so cut them in small pieces

Makes sixty-four 1-inch brownies

5 ounces semisweet or bittersweet chocolate, chopped
2 ounces unsweetened chocolate, chopped
8 tablespoons (1 stick) unsalted butter, cut into quarter
3 tablespoons cocoa powder
3 large eggs
1 1/4 cups sugar
2 teaspoons vanilla extract
1/2 teaspoon salt
1 cup all-purpose flour

1. Adjust oven rack to lower-middle position and heat oven to 350 degrees. Spray 8-inch square baking pan with nonstick vegetable cooking spray. Fold two 12-inch lengths of foil lengthwise so that they measure 7 inches wide. Fit one sheet in bottom of greased pan, pushing it into corners and up sides of pan; overhang will help in removal of baked brownies. Fit second sheet in pan in same manner, perpendicular to first sheet. Spray foil with nonstick cooking spray.
2. In medium heat-proof bowl set over a pan of almost-simmering water, melt chocolates and butter, stirring occasionally until mixture is smooth. Whisk in cocoa until smooth. Set aside to cool slightly.
3. Whisk together eggs, sugar, vanilla, and salt in medium bowl until combined, about 15 seconds. Whisk warm chocolate mixture into egg mixture; then stir in flour with wooden spoon until just combined. Pour mixture into prepared pan, spread into corners and level surface with rubber spatula; bake until slightly puffed and toothpick inserted in center comes out with a small amount of sticky crumbs clinging to it, 35 to 40 minutes. Cool on wire rack to room temperature, about 2 hours, then remove brownies from pan using foil handles. Cut into 1-inch square and serve. (Do not cut brownies until ready to serve; brownies can be wrapped in plastic and refrigerated up to 5 days.)