Wit Whiz!
I think I would make Chef John's Bite-Sized Philly Cheesecake bechamel, double it or not, and put cheddar cheese (he used provolone) in it instead of using Cheese Whiz. I might make his mini ones sometime, too.
Does Cheese Whiz still still taste good? Velveeta which used to be useful tastes terrible now so I don't buy it but Cheese Whiz could be a real time saver. My mother used to use it.