Manicotti: Cheese-Stuffed Pasta in Rich Marinara Sauce

Ingredients

• 1 carton (15 ounces) reduced-fat ricotta cheese
• 1 small onion, finely chopped
• 1 large egg, lightly beaten
• 2 tablespoons minced fresh parsley
• 1/2 teaspoon pepper
• 1/4 teaspoon salt
• 1 cup shredded part-skim mozzarella cheese, divided
• 1 cup grated Parmesan cheese, divided
• 4 cups marinara sauce
• 1/2 cup water
• 1 package (8 ounces) manicotti shells
• Additional minced fresh parsley, optional