Easy Baked Ziti

Name: Easy Baked Ziti
Prep time: 20 min
Cook time: 25 min
Total time: 45 min
Cuisine: Italian
Ingredients: 1 pound Italian sausage; 1 small onion (diced); 28 ounces pasta sauce (or marinara sauce); 14 ounces diced tomatoes (undrained); 2 teaspoons Italian seasoning; ½ cup water; 16 ounces ziti; 15 ounces ricotta cheese; 2 tablespoons fresh parsley; 1 egg; 2 cups mozzarella cheese (shredded ); ¼ cup Parmesan cheese (shredded )