Manicotti - Miz En Place

Ingredients

• 15 ounces reduced-fat ricotta cheese
• 1 small onion, finely chopped
• 1 large egg, lightly beaten
• 2 tbsp minced fresh parsley
• 1/2 tsp black pepper
• 1/4 tsp salt
• 1 cup shredded part-skim mozzarella cheese, divided
• 1 cup grated Parmesan cheese, divided
• 4 cups marinara sauce
• 1/2 cup water
• 8 ounces manicotti shells
• Minced fresh parsley, optional