Combine eggs and remaining 3 tablespoons of sugar. Whisk together to combine, then add half and half, vanilla and salt. Pour mixture evenly over bread. Cover with plastic wrap. If bread extends slightly over the top of the pan, don’t try to squish it down. Just covered it loosely and then seal at the edges. Refrigerate at least 6 hours or as long as 12.
*You can also use a 9x13-inch baking pan. **Baking it on a sheet pan will prevent the bottom of the French toast from getting too brown.