"When your guests arrive, simply take it out of oven to serve! For a special treat, allow the mac & cheese to cool for 5 minutes before drizzling with truffle oil...."
INGREDIENTS
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1 pound elbow macaroni
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1 cup mascarpone
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6 ounces white cheddar
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6 ounces parmigiano reggiano, grated
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6 ounces pecorino romano, coarsely grated
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1/2 cup unsalted butter plus more for greasing baker
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1/2 medium onion, finely chopped
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1/3 cup all-purpose flour
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3 1/2 cups light cream
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bay leaf & thyme leaf
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salt & black pepper to taste
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1/4 teaspoon ground nutmeg