Bring a large pot of salted water to a boil and cook the chickpea pasta until al dente, reserving 0.25 cup of the starchy pasta water before draining.
While the pasta cooks, add the diced pancetta to a cold skillet and turn the heat to medium, sautéing until the fat has rendered and the bits are golden and crispy.
In a small bowl, whisk together the whole egg, egg whites, grated parmesan, and black pepper until the mixture is uniform and slightly frothy.
Add the cooked pasta and frozen peas to the skillet with the pancetta, tossing for 1 minute over medium-low heat to ensure everything is well-coated in the rendered fat.
Remove the skillet from the heat entirely and quickly whisk 2 tablespoons of the hot pasta water into the egg mixture to temper it.
Pour the tempered egg mixture over the pasta, tossing constantly with tongs for 1-2 minutes until the residual heat creates a thick, creamy sauce that clings to the noodles.
Garnish with fresh parsley and serve immediately while the sauce is at its peak silkiness.