The Kitchn: Rule-breaking sheet pan mac and cheese has crispy topping in every bite
Cooking spray
2 cups half-and-half
1 cup water
1/2 teaspoon kosher salt
1 pound sharp cheddar cheese
1 ounce Parmesan cheese
1 cup dry, fine breadcrumbs
1 pound dried cavatappi or tube pasta
1 tablespoon Dijon mustard
1 teaspoon onion powder
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