Creating Classic Baked Mac and Cheese is as easy as following these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Cook Pasta: Boil a large pot of salted water. Add the elbow macaroni and cook until al dente. Drain and set aside.
3. Make Cheese Sauce: In a large saucepan, melt the butter over medium heat. Once melted, whisk in the flour and cook for about 2 minutes until it’s lightly golden.
4. Add Milk: Slowly whisk in the milk, ensuring there are no lumps. Cook on medium heat until the sauce thickens, stirring frequently.
5. Seasoning: Add salt, pepper, and mustard powder to the sauce. Mix well.
6. Incorporate Cheese: Remove from heat and gradually stir in the cheddar and mozzarella cheese until melted and smooth.
7. Combine Pasta and Sauce: Add the cooked macaroni to the cheese sauce and stir until completely coated.
8. Transfer to Baking Dish: Pour the mixture into a greased 9×13 inch baking dish.
9. Optional Topping: If desired, sprinkle breadcrumbs and paprika over the top for an added crunch and flavor.
10. Bake: Bake in the preheated oven for 25-30 minutes or until the top is golden brown and bubbly.
11. Serve: Remove from the oven and allow to cool for a few minutes before serving.

These steps will guide you in creating a classic baked mac and cheese that will be devoured by your family and friends!