Preheat the oven to 350 degrees F. Spray a 9" inch Bundt pan with Pam. In a large bowl, cream together the butter and sugar until light and fluffy. Beat in the eggs one at a time, and then stir in the Breakstone's Sour Cream and vanilla. Combine the flour, baking powder, and salt; stir into the batter just until blended. Fold in blueberries. Spoon half of the batter into the prepared pan.
In a small bowl, stir together the brown sugar, cinnamon and pecans. Sprinkle half of this mixture over the batter in the pan; try to keep mixture in center of batter. Spoon remaining batter over the top, and then sprinkle the remaining pecan mixture over. **Use a knife or thin spatula to swirl the sugar layer into the cake.
Bake for 55 to 60 minutes in the preheated oven, or until a knife inserted into the crown of the cake comes out clean. Cool in the pan over a wire rack. Invert onto a serving plate, and tap firmly to remove from the pan. Dust with confectioners' sugar just before serving.