A stale bagel breakfast casserole turns leftover bagels into a savory, make-ahead meal, with a slow soak helping the dense pieces soften evenly. Learn how to prepare an overnight bagel egg casserole with tender centers and browned edges.
## Essential Concepts
Cut bagels into small pieces, soak them in egg mixture, and refrigerate overnight for an easy breakfast. Related posts: [Everything bagel casserole](/everything-bagel-casserole/) and [cream cheese egg casserole](/cream-cheese-egg-casserole/).
