Guinness Chocolate Cake

Ingredients
For the cake:
9 ounces unsalted butter melted (18 tablespoons or 255g)
1 cup Guinness Stout Foreign Extra beer (250g)
¾ cup all-natural unsweetened cocoa powder measured before sifting (70g)
1 ¾ cup granulated sugar (386g)
⅔ cup sour cream (142g)
2 large eggs
1 tablespoon vanilla extract
2 cups plus 2 tablespoons all-purpose flour (285g)
2 ½ teaspoons baking soda
¼ teaspoon salt
For the icing:
12 ounces cream cheese, room temperature
1 ½ cups powdered sugar (170g)
1 teaspoon vanilla extract
½ cup whipping cream (100g)
Instructions