Refrigerate at least 1 hour or up to overnight. When ready to bake, preheat oven to 375. Bake until bread is golden, and eggs are cooked through, 1 hour. (Cover with foil if top is getting too brown.) ...
If a breakfast casserole calls for meat like ... top bread layer is nearly covered with the milk/egg mixture. Cover with plastic; refrigerate overnight. Remove the plastic before baking.
Often, that holiday breakfast is some kind of overnight bake, assembled the night before ... Then, pour a mixture of eggs and milk, seasoned with a touch of maple syrup, vanilla and cinnamon ...