Blueberry Coffee Cake with Sour Cream

Ingredients

• 1 cup butter, softened
• 2 cups sugar
• 2 large eggs, room temperature
• 1 teaspoon vanilla extract
• 1-3/4 cups all-purpose flour
• 1 teaspoon baking powder
• 1/4 teaspoon salt
• 1 cup sour cream
• 1 cup fresh or frozen unsweetened blueberries
• 1/2 cup packed brown sugar
• 1/2 cup chopped pecans, optional
• 1 teaspoon ground cinnamon
• 1 tablespoon confectioners' sugar