Zucchini casserole

5 medium zucchini’s- sliced 1 onion diced 2  28 oz. cans diced tomatoes 1 tablespoon garlic powder 2 tablespoons Italian seasoning ½ tablespoon oregano 1 tablespoon parsley Slice zucchini about ½ in thick.  Layer in crock pot alternately with onions and tomatoes.  Sprinkling seasonings, over the layers.  Pour ½ cup water over all and cook for about three hours on medium. About 30 mins. before serving, add ½ cup parmesan cheese.  For a different dish, try adding a bag of frozen corn to this recipe.