Bring a large pot of salted water to a boil and cook the whole wheat spaghetti until al dente.
While pasta cooks, dice the chicken breast into bite-sized pieces and season with a pinch of sea salt.
In a large skillet over medium heat, cook the pancetta until crispy, then remove and set aside on a paper towel, leaving the rendered fat in the pan.
Add the diced chicken to the same skillet and sear until golden brown and cooked through, then add the minced garlic for the last 30 seconds of cooking.
In a small bowl, whisk together the large egg, egg whites, grated parmesan cheese, and black pepper until well combined.
Reserve 0.25 cup of the hot pasta water, then drain the spaghetti.
Turn off the heat in the skillet. Add the hot pasta to the chicken and garlic, tossing to combine.
Slowly pour the egg mixture over the pasta while stirring constantly to create a creamy sauce without scrambling the eggs.
Add reserved pasta water 1 tablespoon at a time if needed to reach your desired consistency, then fold in the crispy pancetta and serve immediately.