INGREDIENTS
2 sticks
unsalted butter, room temperature
1 1/3 cups
light brown sugar
3
large eggs, at room temperature
2 cups
all-purpose flour
1 tsp
baking powder
3/4 cup
almond flour
1/2 tsp
salt
1/2 cup
sour cream
1 1/2
to 2 cups fresh blackberries
special equipment suggested: a 9-inch springform baking pan and non-stick baking spray