The recipe called for cream cheese, sugar, egg - mix and spread over a
baked shortbread crumb base. Drizzled melted jam on top. It said to
bake til edges firm but center still 'jiggly'.

I let em sit in fridge overnight, but they still didn't set up. Oh
sure, edible - but only by fork. No way could anyone pick these up as
a finger treat. Even after they sat in the freezer for many hours -
still soft.

A similar recipe I used to use called for cornstarch. Could this be
the binder these pathetic bars needed? I got the recipe off a recipe
site - I re-read it - nothing was omitted.