Cook the manicotti shells according to the package instructions, ensuring they are al dente, about 8-10 minutes.

In a large skillet, add olive oil and sauté chopped onions until translucent, about 3-4 minutes, then add minced garlic and cook for 1 minute more.

Add ground beef or sausage to the skillet and cook until browned, about 5-7 minutes.

Stir in canned tomato sauce and Italian seasoning, simmer for 15-20 minutes.

Combine ricotta, mozzarella, Parmesan, and seasoning in a mixing bowl, mixing until creamy.

Preheat oven to 350°F (175°C).

Stuff each manicotti shell with the cheese filling.

Spread a thin layer of meat sauce in a baking dish, add stuffed manicotti, pour remaining sauce over.

Bake for 25-30 minutes until bubbly and golden.

Let rest for 5 minutes and serve with fresh herbs.