Creating your Million Dollar Spaghetti Casserole is as simple as following these easy steps:

1. Preheat your Oven: Begin by preheating your oven to 350°F (175°C).
2. Cook Spaghetti: In a large pot, cook the spaghetti according to the package instructions until al dente. Drain and set aside.
3. Brown the Meat: In a large skillet, brown the ground beef over medium heat. Add the diced onion and minced garlic, cooking until the onion is translucent.
4. Combine Sauce Ingredients: Stir in the crushed tomatoes, tomato sauce, Italian seasoning, salt, and pepper. Let it simmer for about 5-10 minutes.
5. Mix Cheeses: In a separate bowl, combine the sour cream, cottage cheese, and 1 cup of the mozzarella cheese.
6. Layer the Ingredients: In a large baking dish, start by spreading half of the cooked spaghetti on the bottom. Layer half of the meat sauce over it, followed by the cheese mixture. Repeat the layers.
7. Top with Cheese: Finish by sprinkling the remaining mozzarella and Parmesan cheeses on top.
8. Bake: Cover the dish with aluminum foil and bake for 30 minutes. Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden.
9. Serve: Let it cool for a few minutes before slicing and serving.

Enjoy the mouthwatering aroma that wafts through your kitchen as your casserole finishes baking!