Ingredients:
2 cups all-purpose flour
1/2 cup granulated sugar
2 teaspoons baking powder
1/2 teaspoon baking soda
1/4 teaspoon salt
1/2 cup unsalted butter, at room temperature
1/2 cup sour cream
2 eggs
1 teaspoon vanilla extract
1 cup fresh blueberries
Topping:
1/2 cup all-purpose flour
1/2 cup granulated sugar
1/2 teaspoon ground cinnamon
1/4 cup unsalted butter, at room temperature