Aunty’s Mac and Cheese

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1 pound elbow macaroni

1 stick (1/2 cup) unsalted butter 

1/4 cup all-purpose flour 

1 teaspoon ground mustard 

1 teaspoon garlic powder 

Large pinch kosher salt

Large pinch freshly ground black pepper

1 cup heavy cream 

1/3 cup 2 percent milk 

1 cup hand-shredded extra-sharp yellow Cheddar cheese 

1 cup hand-shredded Parmesan cheese 

1 cup cubed processed cheese, such as Velveeta

1/2 cup sour cream