Bring a large pot of salted water to a boil and cook the chickpea pasta according to package directions until al dente.
While the pasta cooks, place the diced pancetta in a cold skillet and turn the heat to medium, sautéing until the fat renders and the meat is crispy.
In a small bowl, whisk together the whole egg, egg whites, grated parmesan cheese, and black pepper until well combined.
Reserve about 0.5 cup of the starchy pasta water before draining the pasta.
Add the drained pasta directly to the skillet with the pancetta and toss over low heat to coat the noodles in the rendered fat.
Remove the skillet from the heat entirely; slowly whisk 2 tablespoons of the hot pasta water into the egg mixture to temper it.
Pour the egg mixture over the pasta, tossing constantly and vigorously until the sauce thickens into a silky coating without scrambling.
Thin the sauce with additional pasta water if needed, then garnish with fresh parsley and serve immediately.