Lightly grease a 9" x 13" baking dish. In a small saucepan over medium heat, heat the corn syrup, butter and brown sugar until butter is melted and mixture is smooth, about 3 minutes. Pour into prepared pan. Slice bread and place in pan as tightly as possible.
In a large bowl, whisk together the eggs, milk, vanilla, salt and cinnamon. Pour over the bread mixture. Cover and refrigerate overnight.
The next morning, preheat oven to 350° and bake for 35 -40 minutes, until crispy. Sprinkle with confectioner’s sugar and serve.