Preheat oven to 350. Spread two cups spaghetti sauce in a 13" x 9" pan; set aside. Add half cup water to remaining sauce and set aside. In a mixing bowl, combine tofu, parsley, onion powder, salt, garlic powder, and basil. Mix well. Fill cooked shells with tofu mixture. Place shells into pan. Pour spaghetti sauce mixture over top. Sprinkle parmesan cheese over top spaghetti sauce. Bake for 25 minutes, or until bubbly.