In a small saucepan cook and stir brown sugar, butter or margarine, and light corn syrup just till butter or margarine is melted.
Arrange bread slices in a single layer on top of the bown sugar mixture.
If necessary, cut bread to fit into dish. Set baking dish aside. In medium mixing bowl beat eggs, milk, and cinnamon till combined. Pour egg mixture over bread in baking dish. Cover and refrigerate for 2 to 24 hours.