INGREDIENTS
4
Eggs, large
1 1/2 cups
All-purpose flour
1 tsp
Baking powder
1/4 cup
Cocoa powder, unsweetened
1
Confectioners' sugar
1 1/4 cups
Granulated sugar
1/4 tsp
Kosher or coarse sea salt
1 tsp
Vanilla extract
1/2 lb
Butter, unsalted
1/2 cup
Sour cream
1/4 cup
Water, hot