INGREDIENTS
1
Egg
1
Egg yolk
1/4 tsp
Baking soda
1/3 cup
Brown sugar, packed
2 3/4 cups
Cake flour
3/4 tsp
Cinnamon, ground
1
For crumb topping
3/4 cup
Granulated sugar
1
Powdered sugar
1/4 tsp
Table salt
1 tsp
Vanilla extract
1
For the cake
14 tbsp
Butter, unsalted
1/3 cup
Yogurt or buttermilk, plain