1. Bring a large pot of salted water to a boil.
2. Cook bacon in a heavy skillet until crisp.
3. Remove bacon from pan and drain on paper towels. Set bacon aside. Set skillet aside; do not rinse or wash.
4. Cook the pasta as directed on package.
5. Meanwhile, combine the egg yolks or whole eggs, cream, half the Parmesan cheese, nutmeg, and pepper in a medium bowl and beat until well blended.
6. When the pasta is cooked, drain, reserving about 1/3 cup cooking water, and immediately add to the skillet with the bacon drippings.
7. Place over low heat and toss for 1 minute, scraping the pan with tongs to loosen pan drippings.
8. Stir in the egg mixture and toss thoroughly until combined.
9. Add pasta cooking water as needed until a creamy sauce forms.
10. Add the bacon and remaining cheese and toss again to coat
11. Serve immediately.