Guinness Stout Brownies: St. Patrick's Day

Happy St. Patrick's Day! It's a Lovely Day for a Guinness! Add Chocolate! Here's an easy and delicious recipe for Guinness Stout Brownies. The texture of these brownies is great: mousse, candy, fudge, cake. You won't actually taste the stout (although it will make these brownies moist - but you will in the buttercream frosting), so have a pitcher or mug of Guinness on hand to drink while you're making these.

GUINNESS STOUT BROWNIES

Ingredients
1 cup all-purpose flour
3/4 cup unsweetened cocoa powder (I like Scharffen Berger)
1/4 tsp salt
6 Tbsp unsalted Irish butter, cut into cubes
8 ounces dark 60-75% chocolate, chopped
3/4 cup white chocolate (make sure it's real cocoa butter white chocolate), chopped
4 large eggs, at room temperature
1 cup superfine or granulated sugar
1-1/4 cups (10 ounces) Guinness Extra Stout beer (see Note below)
1 cup 60 % chocolate, chopped into small pieces (or chocolate chips)
optional: 1/8 cup confectioners' sugar for dusting

Directions
Preheat oven to 375 degrees.
Line 9 x13-inch baking pan with aluminum foil.
In medium bowl, whisk together flour, cocoa powder, and salt until evenly combined. Set aside.
Melt butter, dark chocolate, and white chocolate in double-boiler over simmering water, stirring constantly until melted. Remove from heat.
In 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. Batter will seem thin.
Drop chocolate smaller bits  (or chips) evenly on top of batter (some will sink in).
Pour into prepared baking pan.
Bake 25 to 30 minutes on center rack in the oven, until toothpick inserted in center comes out almost clean.
Let brownies cool, uncovered, to room temperature.
Optional: Frost with Guinness Buttercream Frosting (I like mine plain)

Note: Guinness should be at room temperature. This recipe uses a little less than a standard 12-ounce bottle of Guinness stout beer. Do not include foam in the measurement. Spoon off foam or let rest until foam subsides. 

Guinness Buttercream Frosting 

Ingredients
1 cup unsalted butter (room temperature)
2 1/2 cups sifted powdered sugar
1/4 cup milk
1/2 whole scraped vanilla bean
1/2 Tbsp pure vanilla extract
1 cup Guinness extra stout

Directions
In saucepan, simmer Guinness on low heat for 10-15 min, until stout becomes reduced and thicker in consistency--similar to syrup. *Tip: keep your eye on the store, so stout does not over cook. Let cool.
In stand mixer, cream butter 1 minute.
Slowly add powdered sugar in thirds, alternating with some milk each time till mixture is creamy.
Add scraped vanilla bean and vanilla extract.
Slowly add reduced Guinness a little at a time. Taste test to desired flavor. You may not use all the Guinness reduction.
Spread on cooled brownies.