Cornbread does not keep well and is best if eaten immediately, or used in some other way. One of our favorite ways to use leftover cornbread is in a Cornbread Breakfast Bake. This leftover makeover breakfast casserole is easy and fun to make, and you can use almost any leftovers to fill it out. Leftover cornbread also freezes well for use later in recipes or as cornbread crumbs.