Bring a large pot of salted water to a boil and cook the whole wheat spaghetti according to package directions until al dente.
Reserve 0.5 cup of the starchy pasta water before draining the noodles.
In a large skillet over medium heat, sauté the diced pancetta until it begins to crisp and release its natural oils.
Add the diced chicken breast to the skillet with the pancetta and cook until golden brown and cooked through.
Stir in the minced garlic and cook for 30 seconds until fragrant, then add the frozen peas to warm through.
In a small bowl, whisk together the whole egg, egg whites, grated parmesan cheese, and black pepper until well combined.
Turn off the heat on the skillet and add the cooked pasta, tossing it with the pancetta, chicken, and peas.
Slowly pour the egg mixture over the pasta while tossing continuously, adding splashes of the reserved pasta water as needed to create a silky, creamy sauce.
Season with sea salt to taste and serve immediately while the sauce is warm and glossy.