INGREDIENTS
1
Egg, large
1
Egg yolk, large
1/4 tsp
Baking soda
1/3 cup
Brown sugar, dark
3 cups
Cake flour
3/4 tsp
Cinnamon, ground
1
Confectioners' sugar
3/4 cup
Granulated sugar
3/8 tsp
Salt
1 tsp
Vanilla extract
1 3/4 sticks
Butter, unsalted
1/3 cup
Buttermilk