The recipe itself is really short (it does, after all, have to fit on the side of a small Jell-O box). It entails creaming ...

Gather your pudding ingredients. Pudding Mix – I prefer the Jell-O instant vanilla pudding mix. Just make sure it says INSTANT on the box. This recipe won’t work with a regular pudding mix.

The 1972 print ad for the Jell-O No-Bake Cheesecake with Pudding says ... sugar and one ingredient you might not expect: ...