INGREDIENTS
1
Egg, large
2 cups
Marshmallow cream such as marshmallow fluff
2 cups
All-purpose flour
1 1/4 tsp
Baking soda
1 cup
Brown sugar, packed
1/2 cup
Cocoa powder, Dutch-process
1 1/4 cups
Confectioners sugar
1 tsp
Salt
2 tsp
Vanilla
2 sticks
Butter, unsalted
1 cup
Buttermilk