I may have to spend the dollar on a potpie to take a look
at the bowl. I don't recall them looking or feeling all that
special, but it was fascinating that they did work.

They're best-known for their inclusion with Hot Pockets, but I find they don't
work that well -- probably because the sleeve surrounds the Pocket too closely
to allow moisture to easily escape. I generally start Hot Pockets bare in the
microwave, then crisp them in the toaster oven.