INGREDIENTS
2 1/2 cups
all-purpose flour plus 1 teaspoon for blueberries and zest
2 tsp
baking powder
1/2 tsp
salt
1 cup
unsalted butter room temperature
1 cup
packed light-brown sugar
1 cup
granulated sugar
4
large eggs
1 tsp
vanilla extract
1 cup
sour cream
2 cups
blueberries
2 tbsp
grated lemon zest
Nonstick cooking spray for pan
Confectioners' sugar for dusting (optional)