In a large bowl, beat the egg, milk and oil. Combine the flour, sugar, baking powder and salt; gradually add to egg mixture, beating just until combined. Fold in blueberries., Pour into a greased 9x5-in. loaf pan. Bake at 350° for 50-55 minutes or until a toothpick inserted in the center comes out clean. Cool for 10 minutes before removing from pan to a wire rack to cool completely., For sauce, combine sugar and cornstarch in a saucepan. Stir in cream until smooth; add butter. Bring to a boil over medium heat; cook and stir for 2 minutes or until thickened. Stir in vanilla. Serve with blueberry bread. Freeze option: Securely wrap and freeze cooled loaf in foil. To use, thaw at room temperature. Prepare sauce as directed and serve with bread.