This recipe is incredibly simple—just layer everything in a casserole dish and bake! It's also flexible—you can sub in almost any protein, grains, vegetables, and cheese. Get creative! You can use fresh, frozen, or leftover cooked vegetables. For fresh or frozen vegetables, thaw/steam them in the microwave before adding to the casserole. *Be sure to use a ready-to-eat creamy soup, not condensed. If all you have is condensed, thin it out with milk, broth, or water before adding to the casserole.