Guinness Brownies with Maple Buttercream Frosting

INGREDIENTS

1 cup

Guinness beer, at room temperature

1 cup

all purpose flour

3/4 cup

unsweetened cocoa powder

1/2 tsp

kosher salt

8 oz

bittersweet chocolate (60% to 70% cacao), chopped

3/4 cup

white chocolate chips

6 tbsp

unsalted butter, cut into chunks

eggs, room temperature

1 cup

granulated sugar

1/2 cup

semi-sweet chocolate chips

1/4 cup

unsalted butter, room temperature

1/4 tsp

kosher salt

to 2 1/2 cups powdered sugar

1 tsp

maple extract

2 tbsp

milk to thin frosting