Grate your pecorino cheese and set aside.
Cut your emmental cheese into small cubes. PS: If you don't like chunks into your cheese sauce, then you may want to grate this too. Boil the water for the pasta with plenty of salt.
Add the cooking cream to your pan and season. Let it heat up over the heat.
Once hot, add the hard cheeses to start melting: the pecorino you grated and the emmental you prepared. Mix well from time to time to help them melt, and lower the heat so the cheese sauce doesn't stick or burn.
Cut your blue cheese into cubes and get your Philadelphia cream cheese ready to be used.
Throw your pasta to cook.
Add the cream cheeses: the cut blue cheese and the tablespoons of cream cheese, and mix well.
Continue mixing while the pasta is cooking. When your quattro formaggi cheese sauce has reached your preferred consistency (I like it a little chunky), take it off the heat.
Drain the pasta, saving some pasta water, and adding it back to the pot with pasta.
Add the quattro formaggi pasta sauce to your penne, and mix well.
Quickly plate and enjoy.PS: The pasta shouldn't get dry too quickly as both the cream and Philadelphia cheese are helping it stay creamy and moist. But don't wait too long to enjoy it. Feel free to garnish with some fresh parsley and add an extra dash of black pepper.