Cut bacon into small squares, cook until crispy brown
Drain bacon fat in a small bowl and reserve both fat and bacon bits separately
Combine cheeses in a bowl and add pepper to taste
Cook pasta following box's directions, add one cup of the pasta water to your cheese mixture
Drain pasta and set aside
Add egg yolks, and bacon fat to cheese mixture, whisk until combined
Add mixture to cooked pasta (on the same pot you cooked the pasta) and mix
Serve, topping with bacon bits and Parmesan cheese