Creating Million Dollar Spaghetti is straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Cook Spaghetti: Boil a large pot of salted water. Add spaghetti and cook according to package instructions until al dente. Drain and set aside.
3. Brown Meat: In a large skillet, brown the ground beef and Italian sausage over medium heat. Add the chopped onion and minced garlic, cooking until the onion becomes translucent.
4. Add Marinara: Pour in the marinara sauce, stirring to combine. Let it simmer for about 10 minutes.
5. Mix Cheeses: In a separate bowl, combine the ricotta cheese, grated Parmesan, Italian seasoning, salt, and pepper. Mix until well blended.
6. Layer Ingredients: In a 9×13 inch baking dish, start by spreading a layer of the meat sauce on the bottom. Follow with half of the cooked spaghetti, then half of the ricotta mixture, and a sprinkle of mozzarella cheese.
7. Repeat Layers: Add another layer of the meat sauce, the remaining spaghetti, the rest of the ricotta mixture, and top with the remaining meat sauce. Finish with the remaining mozzarella cheese.
8. Bake: Cover with aluminum foil and bake for 25 minutes. Remove the foil and bake for an additional 15 minutes, or until the cheese is bubbly and golden.
9. Cool: Remove from the oven and let it cool for about 15 minutes before serving.
10. Garnish: If desired, sprinkle fresh basil on top for added flavor and presentation.

These steps will guide you in creating this incredible dish effortlessly.