Creating Creamy Macaroni and Cheese is straightforward if you follow these simple steps:

1. Cook the Macaroni: Bring a large pot of salted water to a boil. Add the elbow macaroni and cook according to package instructions until al dente. Drain and set aside.
2. Make the Roux: In a large saucepan, melt the butter over medium heat. Once melted, add the flour and whisk constantly for about 1 minute until it forms a paste.
3. Add Milk: Gradually add the whole milk while whisking continuously to avoid lumps. Cook until the mixture thickens slightly, about 3-5 minutes.
4. Add Spices: Stir in garlic powder, onion powder, salt, black pepper, and mustard powder if using. Mix until combined.
5. Add Cheeses: Lower the heat and add the shredded cheddar, mozzarella, and Parmesan cheeses. Stir until the cheese melts and the sauce is smooth.
6. Combine Pasta and Sauce: Add the cooked macaroni to the cheese sauce. Stir well to coat all the pasta evenly.
7. Transfer to Baking Dish (optional): If you prefer a baked version, preheat your oven to 350°F (175°C). Transfer the mac and cheese to a greased baking dish.
8. Bake (optional): For a crunchy top, sprinkle additional cheese or breadcrumbs on top and bake for 15-20 minutes until golden and bubbly.
9. Serve: Remove from the oven, let it cool for a few minutes, then serve warm.