Blueberry Sour Cream Coffee Cake
1 cup butter, softened 2 cups white sugar 2 eggs 1 cup sour cream 1 teaspoon vanilla extract 1 5/8 cups all-purpose flour1 teaspoon baking powder 1/4 teaspoon salt 1 cup fresh or frozen blueberries1/2 cup brown sugar 1 teaspoon ground cinnamon 1/2 cup chopped pecans 1 tablespoon confectioners' sugar…