Creamy Panera Copycat Mac & Cheese

1 lb cavatappi pasta 1/4 cup butter, cubed 1/4 cup all-purpose flour
2 cups heavy cream 2 cups 2% milk 1/4 teaspoon pepper
1 tbsp ground mustard 12 oz shredded white cheddar cheese 4 slices white American cheese 1/4 cup grated Parmesan cheese

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