INGREDIENTS
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Unsalted butter, for greasing
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1 pound spaghetti
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6 ounces Mozzarella cheese, shredded (2 cups)
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6 ounces sharp white cheddar cheese, shredded (2 cups)
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1 1/2 cups whole milk
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3/4 cup grated Parmigiano-Reggiano cheese
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3 large eggs, lightly beaten
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2 1/2 teaspoons pepper
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2 teaspoons kosher salt
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1 jar pasta sauce for serving