Bring a large pot of water to a boil, season generously with sea salt, and cook the high-protein spaghetti until al dente.
While the pasta is boiling, dice the pancetta and add it to a large skillet over medium heat, sautéing until the fat has rendered and the bits are golden and crispy.
In a small mixing bowl, whisk together the two whole eggs, the egg white, and the grated parmesan cheese until well combined and smooth.
Just before the pasta is finished, carefully reserve 0.25 cup of the starchy pasta cooking water and set it aside.
Drain the spaghetti and immediately add it to the skillet with the crispy pancetta, tossing for 30 seconds to coat the strands in the flavorful oils.
Remove the skillet from the heat entirely to prevent the eggs from scrambling, then pour in the egg and cheese mixture while tossing the pasta vigorously.
Slowly add the reserved pasta water one tablespoon at a time while continuing to toss until a creamy, glossy sauce forms.
Season with freshly cracked black pepper and garnish with chopped fresh parsley before serving immediately.