An easy make-ahead sourdough French toast casserole that combines the tangy flavor of sourdough with a cinnamon-vanilla custard soak, perfect for a comforting and stress-free breakfast or brunch.
Use stale bread for best custard absorption. Soak overnight for optimal texture. Tent with foil if edges brown too quickly. Can be made dairy-free by substituting milk and butter with plant-based alternatives. Can freeze before baking and bake after thawing with slightly longer bake time.
Keywords: sourdough, French toast casserole, make-ahead breakfast, easy brunch, cinnamon, vanilla, custard, maple syrup