01 - Fill a large saucepan with water, add salt, and bring to a rolling boil. Stir in orzo and cook until al dente following package directions. Reserve about 3.4 fluid ounces pasta water before draining.
02 - While the orzo cooks, thoroughly whisk eggs, Parmesan, heavy cream (if using), and black pepper together in a mixing bowl until smooth.
03 - Heat a large skillet over medium. Add the diced pancetta and cook until golden and crisp, 5-6 minutes. If necessary, drizzle in olive oil to prevent sticking.
04 - Reduce skillet heat to low. Add drained orzo to the skillet, tossing with the pancetta until evenly coated.
05 - Remove skillet from the stovetop. Quickly pour in the egg-Parmesan mixture and stir constantly, allowing the sauce to emulsify without scrambling. Incorporate reserved pasta water as needed for a creamy consistency.
06 - Taste and refine with additional salt and freshly ground black pepper if needed.
07 - Serve immediately, topping portions with extra Parmesan and a sprinkle of chopped parsley if desired.