- Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish with cooking spray or olive oil.
- Bring a large pot of salted water to a boil. Cook the manicotti according to the package instructions until al dente. Drain the pasta and rinse it under cold water to stop the cooking process. Set aside.
- In a mixing bowl, combine the ricotta cheese, shredded mozzarella cheese, grated Parmesan cheese, egg, chopped parsley, salt, pepper, garlic powder, and onion powder. Mix until well combined.
- Spoon the cheese mixture into a piping bag or a large resealable plastic bag with one corner snipped off. Alternatively, you can use a spoon to fill the manicotti tubes.
- Spread a thin layer of marinara sauce on the bottom of the prepared baking dish.
- Carefully fill each manicotti tube with the cheese mixture and arrange them in a single layer in the baking dish.
- Once all the manicotti are filled and arranged in the baking dish, spoon the remaining marinara sauce evenly over the top, covering the manicotti completely.
- Sprinkle the shredded mozzarella cheese over the top of the sauce.
- Cover the baking dish with aluminum foil and bake in the preheated oven for 25-30 minutes, or until the sauce is bubbly and the cheese is melted and lightly golden brown.
- Remove the foil and continue baking for an additional 5-10 minutes, or until the cheese is fully melted and bubbly.
- Once done, remove the manicotti from the oven and let them cool slightly before serving.
- Garnish with chopped fresh parsley, if desired, and serve hot.
Enjoy your delicious Manicotti with 3-Cheese Filling! It’s a comforting and satisfying meal that’s perfect for any occasion.