INGREDIENTS
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2 tablespoons unsalted butter
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8 ounces thin spaghetti
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4 large eggs
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2 cups whole milk
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1 teaspoon Dijon mustard
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1/4 teaspoon cayenne pepper
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Salt and freshly ground black pepper
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1 cup (4 ounces) shredded cheddar or cheddar-Monterey Jack blend cheese
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1/2 cup grated Parmesan cheese
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1 tablespoon chopped fresh parsley, for garnish, if desired