Ingredients:
For the Filling:
4 cups fresh or frozen blueberries
1/2 cup granulated sugar
1 tablespoon lemon juice
1 teaspoon lemon zest
1 tablespoon cornstarch
For the Topping:
1 cup all-purpose flour
1/2 cup granulated sugar
1 teaspoon baking powder
1/2 teaspoon salt
