INGREDIENTS
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12 ounces elbow macaron
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3 tablespoons butter
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3 tablespoons flour
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2 teaspoons yellow mustard
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3 cups milk
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1/4 cup diced yellow onion
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1/2 teaspoon paprika
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1 teaspoon salt
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2 cups shredded sharp Cheddar cheese
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4 slices American cheese
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3/4 cup Panko breadcrumbs
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1/4 cup grated Parmesan cheese