INGREDIENTS
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4 tablespoons unsalted butter, plus more for the dish
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Kosher salt
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3/4 pound medium pasta shells
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1/2 cup diced onion
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6 ounces chicken-apple sausage, sliced 1/2 inch thick
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1 tablespoon mustard powder
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1/4 teaspoon cayenne pepper
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1/4 cup all-purpose flour
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3 cups apple juice
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1 pound monterey jack cheese, shredded (4 cups)
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1/2 pound extra-sharp cheddar cheese, shredded (2 cups)
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1/2 cup sour cream
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35 small butter crackers (1 sleeve Ritz), crushed