Grill pans are generally used because they give those nice lines that people like. Flavor wise, a grill pan isn’t doing anything a regular pan can’t accomplish. This recipe calls for baking the cutlets, and in general, you will always get better results using non-disposable bakeware. That being said, in a pinch, you can use disposable. You may need to extend cooking time, and your chicken may be drier and won’t brown as nicely. You can also cook these in a skillet or grill pan on the stovetop.