Cook manicotti noodles in boiling water until 3 minutes shy of al dente. Rinse in cold water and set aside. Cook ground beef in a skillet over medium heat until no longer pink. Drain and set aside.
Preheat oven to 350 degrees F. Coat a 9×13 baking dish with cooking spray and set aside.
In a medium bowl, combine ricotta cheese, 1 cup of the mozzarella, Parmesan cheese, egg and Italian seasoning. Mix well. Even pour half of the spaghetti sauce into the bottom of the prepared baking dish. Divide the cheese mixture between 10 cooked manicotti shells. Carefully stuff the cheese into the shells and form two rows in the baking dish.
Pour remaining sauce over the manicotti, followed by the cooked ground beef and remaining 1/2 cup of mozzarella cheese. Bake in the preheated oven for 30 minutes. Serve warm!
Notes
If you prefer a more simple sauce, with a tomato base, you can use a jar of marinara sauce instead if that's what you prefer or have on hand. It'll taste great!
Replace the beef with ground sausage for an even more flavorful dish.