In a small bowl, combine flours and baking powder. In a small bowl, beat cream cheese until smooth. Beat in the egg, sugar substitute, potato, chai mix and milk. Stir into dry ingredients just until moistened. Fold in cranberries.
Transfer to a 5-3/4-in. x 3-in. x 2-in. loaf pan coated with cooking spray. Bake at 350° for 35-40 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing from pan to a wire rack. Yield: 1 mini loaf (6 slices).