Hoxierence 20oz Small Ceramic Baking Dishes, 7.5L x 5.4W Inch Stone Embossed Pattern Bakeware with Double Handles, Individual Rectangular Baker for Lasagna, Casserole - Set of 4 (Gray)Material Ceramic Brand Hoxierence Colour Gray Finish type Non stick,Embossed What is a casserole, exactly? Today, a casserole dish is a deep dish made from glass or ceramic material safe for the oven. They can be large or small, plain or decorative. Most casserole dishes don't have lids since casseroles tend to be baked uncovered. In a nutshell (or acute individual CorningWare casserole dish), an American style casserole is any dish made up of