Warm Cinnamon-Spiced Blueberry Cake

Ingredients

• 1 1/3 cups (6 ounces/170 grams) all-purpose flour
• ¾ teaspoon baking powder
• ¼ teaspoon baking soda
• ¾ teaspoon ground cinnamon
• ¼ teaspoon table salt
• 6 tablespoons (3 ounces/85 grams) unsalted butter, at room temperature
• 1 cup (8 ounces/227 grams) granulated sugar
• 2 large eggs
• 1 teaspoon pure vanilla extract
• 2/3 cup (5½ ounces/156 grams) sour cream
• ¾ cup (3 ounces/85 grams) blueberries, rinsed and well dried
• 3 tablespoons granulated sugar
• 1 tablespoon all-purpose flour
• ½ teaspoon ground cinnamon