A comforting and easy-to-make overnight French toast casserole that soaks bread in a cinnamon-vanilla custard, perfect for busy mornings and make-ahead breakfasts.
Use day-old bread to avoid mushy texture. Whisk eggs gently to prevent curdling. If top browns too fast, tent with foil. Can prepare in the morning and bake immediately by adding 10-15 minutes to baking time. For dairy-free, substitute milk with almond/oat/coconut milk and butter with coconut oil or dairy-free margarine.
Keywords: overnight French toast casserole, make-ahead breakfast, cinnamon vanilla custard, easy breakfast casserole, brioche French toast bake