Add pasta, 4 cups water, whipping cream and cheese. Put lid on lock, place valve to no venting, press the steam button and adjust time to 5 minutes. Do an immediate release and stir until well combined.
The real CPK recipe uses milk mixed into the whipping cream, but for the sake of easiness and getting the measurements exact I omitted it. Feel free to add milk and subtract some cream and whip, before melting with cheese!