These one-dish wonders—AKA breakfast casseroles—are crowd-pleasers for breakfast, brunch, or even dinner! They can be made ahead of time and feed a crowd, plus the leftovers reheat well. Customize these easy make-ahead breakfast casserole, breakfast strata, or frittata recipes with your favorite ingredients; or try this favorite everything bagel breakfast casserole. Baked French toast casserole is also a big hit with hungry houseguests!