Meanwhile, bring half-and-half, basil, crushed red pepper to a simmer in a heavy large saucepan over medium high heat. Add cheeses 1 handful at a time, stirring constantly until cheese are melted and smooth. Remove from heat, and stir in egg yolks and season with salt and pepper. Mix in pasta. Spoon into prepared dish. Bake until heated through, approximately 10 minutes. Serve hot.
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