Follow these easy steps to create your Million Dollar Macaroni and Cheese Casserole:

1. Preheat Your Oven: Begin by preheating your oven to 350°F (175°C).
2. Cook the Pasta: Bring a large pot of salted water to a boil. Add macaroni and cook according to package instructions until al dente. Drain and set aside.
3. Prepare Cheese Mixture: In a large bowl, combine the cheddar cheese, mozzarella cheese, cottage cheese, and sour cream. Mix until well blended.
4. Add Eggs and Seasonings: Beat the eggs separately in a small bowl, then add to the cheese mixture along with melted butter, Dijon mustard, garlic powder, and onion powder. Stir thoroughly to combine.
5. Combine Pasta and Cheese: Fold in the cooked macaroni to the cheese mixture. Season with salt and pepper to taste.
6. Transfer to Baking Dish: Pour the macaroni and cheese mixture into a greased 9×13-inch baking dish, spreading it evenly.
7. Prepare Topping: In a small bowl, mix the crushed buttery crackers and grated Parmesan cheese. Sprinkle this topping evenly over the macaroni and cheese layer.
8. Bake: Place the baking dish in the preheated oven and bake for about 30-35 minutes, or until the top is golden and bubbly.
9. Cool Slightly: Once baked, remove from oven and let it cool for about 10 minutes before serving. This helps firm up the casserole for easier serving.
10. Garnish: If desired, garnish with fresh parsley before serving for an added touch of color!

By following these steps, you will create a jaw-droppingly delicious Million Dollar Macaroni and Cheese Casserole that people will rave about!