This Apple Cinnamon French Toast Bake is a comforting casserole-style dish made with layers of bread soaked in a custard mixture and topped with tender apple slices and warm cinnamon. After baking, it develops a golden-brown top with a soft, custardy interior filled with cinnamon-apple flavors, resembling a breakfast pudding or bread pudding.
For best results, use slightly stale bread to ensure it soaks up the custard well. You can prepare the bake ahead of time and refrigerate overnight before baking.