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Add the chicken to the pan with the pancetta and stir to combine. Next, add the spaghetti and the cream mixture and toss over medium-low heat until the chicken is heated through and the sauce coats the spaghetti thickly, about 4 minutes (do not boil or you might end up scrambling the eggs). Season the pasta, to taste, with pepper and salt if needed (the pancetta will likely add all the salt you need). Transfer the pasta to a large wide serving bowl. Sprinkle the walnuts and lemon zest over, and serve.