Place half of the bread cubes in a greased shallow 3-quart baking dish. Sprinkle with blueberries. In a large bowl, beat cream cheese until smooth. Beat in the eggs, yogurt, sour cream, vanilla and cinnamon. Gradually add milk and 1/3 cup syrup until blended. Pour half over the bread. Top with the remaining bread and cream cheese mixture. Cover and refrigerate overnight. Remove from the refrigerator 30 minutes before baking. Cover and bake at 350° for 30 minutes. Uncover; bake 20-25 minutes longer or until a knife inserted near the center comes out clean. Sprinkle with additional blueberries if desired. Let stand for 5 minutes. Serve with syrup.