Because you should be allowed to have your gluten-free mac and cheese and eat it too. (That's how the idiom goes, right?)
Ingredients
12 ounces uncooked gluten-free macaroni
1/4 cup butter
1/4 cup gluten-free baking flour (with xanthan gum)
2 cups whole milk
1-1/2 cups shredded sharp cheddar cheese
1/2 cup shredded mozzarella cheese
1/2 cup shredded parmesan cheese
1-1/4 teaspoons salt
1/2 teaspoon pepper
1/4 teaspoon garlic powder
1/4 teaspoon ground mustard
1/4 teaspoon ground nutmeg
Directions
Cook macaroni according to package directions. Drain; set aside.
In a large sauce pot or Dutch oven, melt butter over medium heat. Add flour; whisk until smooth. Gradually add milk, bring to a simmer. Cook until thickened, 3-4 minutes, whisking occasionally. Add cheddar, mozzarella, parmesan, salt, pepper, garlic powder, mustard and nutmeg; stir until cheese has melted. Stir in cooked macaroni.