Combine syrup, butter, and brown sugar in a sauce pan; bring to a boil and simmer uncovered for several minutes or until syrup-like consistency.
Whisk eggs, milk, vanilla, salt and cinnamon in a mixing bowl.
Pour syrup mixture into the bottom of a 13 x 9 x 2-inch baking pan. Layer apple slices in the syrup.
Lay the bread slices on top of the apples. Pour egg mixture over all, cover and refrigerate overnight.
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