A casserole is any food that you prepare in your casserole dish, which is a wide and deep dish for baking in an oven. It's a one-pot meal. It can have many layers, like what you find in Italian lasagna. It can have different combinations of protein and veggies. And, of course, casseroles can have a variety of meat and fish. Casseroles have a long history. It first came under the spotlight during the Great Depression and remained popular throughout...