Preheat your oven to 350°F (175°C). Cook the spaghetti according to package instructions until al dente, drain, and set aside.

In a large skillet over medium heat, brown the ground beef or Italian sausage with the minced garlic, breaking the meat into small pieces as it cooks. Drain any excess grease.

Stir the marinara sauce into the cooked meat. Add Italian seasoning, salt, and pepper. Simmer the sauce for about 10 minutes to meld the flavors together.

In a bowl, combine the ricotta cheese, cream cheese, sour cream, and eggs. Mix until smooth. This will be your creamy cheese layer.

In a greased 9x13 inch baking dish, spread a thin layer of the meat sauce. Follow with a layer of cooked spaghetti. Over the spaghetti, spread the cheese mixture evenly. Top with another layer of meat sauce. Sprinkle the shredded mozzarella and grated Parmesan cheese over the top.

Cover the baking dish with aluminum foil and bake in the preheated oven for 30 minutes. Then, remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and slightly golden.

Let the baked spaghetti stand for 10 minutes before serving. Garnish with fresh parsley or basil if desired. Serve hot and enjoy the rich, comforting layers of flavor.