In a small saucepan combine the syrup, butter and
brown sugar; simmer until syrupy. Pour this mixture into a 9" x 13" baking pan thathas been sprayed with Pam. Set aside.
Slice the loaf into thick slices, and place the syrup in the baking pan. Place the bread on top of the syrup.
In a large bowl, whisk together the eggs, cream,
vanilla, Grand Marnier and salt. Pour evenly over the bread. Cover and refrigerate overnight.
In the morning, leave the casserole at room
temperature while the oven preheats. Bake at 350 degrees uncovered, for 45 minutes.