Formula:
- 2-1/2 cups all motive flour
- 1/2 tsp baking soda
- 1-1/4 tsp baking powder
- 1/2 tsp salt
- 1/2 cup plus 2 tbsp unsalted butter, at room temperature
- 1 cup sugar
- 3 tidy eggs
- 1-1/2 tsp pure vanilla extract
- 1-1/4 cups sour cream
- 2-1/4 cups all motive flour
- 3/4 cup packed darkish brown sugar
- 2-1/4 tsp ground cinnamon
- 3/4 tsp salt
- 1/2 cup plus 2 tbsp unsalted butter, chilled
- 1-1/2 cups confectioners' sugar
- 3 tbsp milk