INGREDIENTS
1 cup
firmly packed brown sugar
1/2 cup
unsalted butter, softened
1
large egg
1 tsp
pure vanilla extract
2 cups
all-purpose flour
3/4 tsp
baking powder
3/4 tsp
baking soda
1/3 cup
sour cream
1 cup
salted cashews, chopped
For the Frosting
1/2 cup
unsalted butter
2 cups
powdered sugar
3 tbsp
milk
1 tsp
pure vanilla extract