1
Bring a large pot of salted water to boil and cook spaghetti according to package instructions until al dente.
2
While pasta cooks, heat a large skillet over medium heat. Add pancetta and cook until crispy, about 6-8 minutes.
3
In a bowl, whisk together eggs, grated cheeses, and plenty of black pepper.
4
Reserve 1/2 cup of pasta water, then drain the pasta.
5
Working quickly, add hot pasta to the skillet with pancetta, removing from heat.
6
Pour the egg and cheese mixture over the pasta, tossing continuously until a creamy sauce forms. Add a splash of pasta water if needed to loosen the sauce.
7
Season with additional black pepper and salt if needed. Serve immediately with extra grated cheese on top.