In a large saucepan over medium heat, melt the butter. Whisk in the flour and cook for 2 minutes, stirring often.
3 tablespoons butter, 3 tablespoons all-purpose flour
Slowly drizzle in the milk, whisking constantly. Then add the cream and continue to whisk.
1 cup whole milk, 2 cups heavy cream
Use a microplane to grate the nutmeg. I use about a 1/2 teaspoon.
nutmeg
Add the granulated garlic, and ground mustard. Season with salt and pepper to taste.
1/2 teaspoon garlic powder, 1 teaspoon ground mustard, salt and black pepper
Reserve about 2 ounces of cheese for the topping
8 ounces gouda cheese, 8 ounces sharp cheddar cheese
When the cream mixture is very warm, begin adding the cheese about 1/4 cup at a time. Whisk well after each addition and make sure the cheese is melted before adding the next batch.
After the cheese is all incorporated, taste for seasoning and add additional salt and pepper as needed. You can also add a pinch of cayenne pepper if you would like to give your cheese sauce a little kick.
Use spatula or wooden spoon to fold the pasta into the cheese sauce.
1 lb pasta such as cavatappi or shells