INGREDIENTS
FOR THE CRUMB TOPPING:
2/3 cup
dark brown sugar
1 tsp
ground cinnamon
1/2 tsp
salt
8 tbsp
unsalted butter, melted
1 3/4 cups
cake flour
FOR THE CAKE:
1 1/4 cups
cake flour
1/2 cup
granulated sugar
1/4 tsp
baking soda
1/4 tsp
salt
6 tbsp
unsalted butter, cut into 6 pieces at room temperature
1
large egg
1
egg yolk
1 tsp
vanilla extract
1/3 cup
buttermilk