INGREDIENTS
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1/2 cup milk
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1/2 cup butter
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3/4 teaspoon salt
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1 cup all-purpose flour
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6 large eggs
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1 1/2 cups (6 oz.) shredded Gruyère cheese
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2 tablespoons grated Parmesan cheese
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1 1/2 teaspoons Dijon mustard
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1/8 teaspoon ground red pepper