In an 11x17 pan, combine brown sugar, butter and maple syrup. Cook until dissolved and bubbly, approximately 5 minutes. Do not let butter burn. Meanwhile, spread 8 slices of bread with cheese and sprinkle with cinnamon. Place remaining 8 slices on top to make sandwiches, and cut sandwiches in half diagonally to fit the pan (do not overlap). Blend eggs, milk, and vanilla; pour over sandwiches. Cover and let set for at least 40 minutes or overnight in refrigerator. Uncover and bake at 350 degrees for 30-40 minutes. Flip bread over when removing from pan. If a crustier top is preferred, place back in oven for a few minutes longer. Top with a spoonful of yogurt or sour cream and sprinkle with fresh berries. Serves 8.