There are a few reasons why your finished chicken parm might be watery. First, your mozzarella might have too much moisture in it. I recommend patting your slices of fresh mozzarella cheese dry before adding them to the top of the chicken fillets. Second, if you’re serving this chicken parmesan over spaghetti, you might not have drained your pasta thoroughly enough. Any leftover moisture in the pasta will only add to the potential wateriness of this dish.