Overnight French Toast Casserole - assemble the night before and let sit in the refrigerator until ready to bake. This is SO good!! The best part of the whole casserole is the yummy caramelized brown sugar on the bottom. French bread, brown sugar, butter, milk, eggs, vanilla, cinnamon and salt. Ridiculously good! Great for overnight guest and Christmas morning!! #makeahead #christmas #breakfast #casserole #christmasbreakfast