Blueberry Sour Cream Coffee Cake

INGREDIENTS

• 1 cup butter, softened
• 2 cups white sugar
• 2 eggs
• 1 cup sour cream
• 1 teaspoon vanilla extract
• 1 5/8 cups all-purpose flour
• 1 teaspoon baking powder
• 1/4 teaspoon salt
• 1 cup fresh or frozen blueberries
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• 1/2 cup brown sugar
• 1 teaspoon ground cinnamon
• 1/2 cup chopped pecans
• 1 tablespoon confectioners' sugar for dusting