Cook spaghetti according to directions on package until just done, al dente.
Melt butter, add cream, pepper, oregano and bacon. Simmer, stirring 5 minutes. Drain spaghetti through large colander.
Transfer it to heated serving bowl and stir in beaten raw egg yolks, which will cook on contact with the hot pasta. Stir in cream/butter sauce and mix thoroughly. Garnish with parsley.
Source: My Old Recipes