Bring a large pot of salted water to a boil and cook the chickpea spaghetti according to package directions until al dente.
While the pasta cooks, add the diced pancetta to a large cold skillet and turn the heat to medium, rendering the fat until the meat is golden and crispy.
Add the diced cooked chicken breast to the skillet with the pancetta, tossing for 1-2 minutes just to warm through and coat in the flavorful oils.
In a small bowl, whisk together the eggs and grated Pecorino Romano until well combined and slightly frothy.
Reserve 0.25 cup of the starchy pasta water, then drain the spaghetti and immediately add it to the skillet with the pancetta and chicken.
Remove the skillet from the heat entirely; this is crucial to prevent the eggs from scrambling.
Pour the egg and cheese mixture over the pasta, tossing vigorously and adding a splash of pasta water as needed to create a silky, emulsified sauce.
Season with sea salt and a heavy dusting of freshly cracked black pepper, then garnish with chopped parsley before serving immediately.