6tablespoonsunsalted room temperature buttercut into cubes
8ouncesdark or bittersweet chocolate, chopped(460 grams)
¾cupwhite chocolate chips(114 grams)
4largeeggs
1cupsuperfine or granulated sugar(200 grams)
1-¼cups10 ounces Guinness Extra Stout beer**
1cupsemisweet chocolate chips
⅛cupabout confectioners' sugar for dusting
Instructions
Preheat the oven to 375 degrees F. Line a 9 x 13-inch baking pan with nonstick foil or grease and line with parchment paper.
In a medium bowl, whisk together flour, cocoa powder, and salt until evenly combined.
Melt butter, bittersweet chocolate and white chips in a double-boiler over very low heat, stirring constantly until melted. Remove from heat. Alternatively, you may do this in the microwave, microwaving on high and stirring every 30 seconds.
In a large mixing bowl, beat eggs and sugar on high speed until light and fluffy, about 3 minutes. Add melted chocolate mixture, beating until combined.
Beat reserved flour mixture into melted chocolate mixture. Whisk in Guinness stout beer. The batter will seem a bit thin, and will lighten a bit from the fizziness of the beer. Make sure that the batter is cool (not warm from the chocolate) then fold in the chips.
Pour into prepared baking pan. Bake 25 to 30 minutes on center rack in the oven, until a toothpick inserted in the center comes out almost clean.
Let brownies cool, uncovered, to room temperature. Dust with confectioners' sugar before serving.
Notes
There was a note saying the beer should be at room temperature, but I didn't bother bringing it to room temperature and nothing terrible happened.