Cook the macaroni pasta according to package instructions. Drain and set aside.

In a large saucepan, melt butter over medium heat. Add flour and whisk continuously to create a roux. Cook for 2-3 minutes to remove the raw taste of the flour.

Gradually pour in the milk, whisking constantly to avoid lumps. Continue to cook until the mixture thickens to a smooth consistency.

Reduce the heat to low and add shredded cheddar cheese and grated Parmesan. Stir until the cheeses are completely melted and the sauce is smooth.

Season the cheese sauce with salt and pepper to taste. For extra flavor, you can add a pinch of mustard or a dash of hot sauce if desired.

Add the cooked macaroni to the cheese sauce, stirring to coat the pasta evenly.

Serve the Classic Mac and Cheese hot, garnished with additional grated cheddar and Parmesan if desired. Enjoy your creamy and comforting dish!