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1. In a small saucepan, melt the butter over medium heat. Add the brown sugar and corn syrup, stirring until the sugar is dissolved and the mixture is smooth. Pour this mixture into a 9×13 inch baking dish.
2. Arrange the bread slices in a single layer over the butter and brown sugar mixture. You can cut the bread to fit the dish if necessary.
3. In a large mixing bowl, whisk together the eggs, half-and-half cream, vanilla extract, Grand Marnier (if using), and salt until well combined.
4. Pour the egg mixture evenly over the bread slices. Gently press down on the bread so it absorbs the custard.
5. Cover the baking dish with plastic wrap and refrigerate overnight, or for at least 8 hours.
6. Preheat the oven to 350°F (175°C). Remove the plastic wrap from the baking dish and let it sit at room temperature while the oven preheats.
7. Bake the French toast in the preheated oven for 35-40 minutes, or until puffed and golden brown. Let it rest for a few minutes before serving. For an extra touch, sprinkle granulated sugar over the top and use a kitchen torch to caramelize it until golden and crisp.
