Combine sugar, butter, and corn syrup in a small saucepan; cook over medium heat until thickened, stirring constantly.
Pour syrup mixture into a 13 x 9 x 2 inch baking dish. Place 6 slices of bread on top of syrup mixture. Top with remaining 6 slices of bread.
Combine eggs, milk, vanilla, and salt stirring until blended. Pour egg mixture evenly over bread slices.
Cover and chill 8 hours.
Bake, uncovered, at 350° for 40-45 minutes or until lightly browned.
Please Note: Nutritional values listed may vary from final results depending on actual measurements and brands used to prepare the recipe.