I'm German and I suspect it's a bit cringier than that. Out of the products you listed peanut butter is the only one that's available virtually everywhere. You can get all of the other stuff as well but mostly online or at dedicated candy shops. The only other item I can think of is Jack Daniel's and probably some other spirits. So what was sold in the US section? The answer is probably German made stuff that's stereotypically American. This may include spray cheese, creatively flavored bbq sauces, other condiments like relish, brioche burger and hot dog buns, cookies, brownies, muffins, donuts and my favorite because you guys don't even eat that: actual plastic buckets filled with sweet popcorn.

[–] ricecake@sh.itjust.works 7 points 5 hours ago

Heh, fair enough. I took a look at some pictures of US grocery sections at European stores and applied the huristic of:

if it's there, it's not super popular.
If I would buy it regularly, chances are a European would too, just not as many, see point one.
if it's awful it's being sold as an amusing novelty.
if I wouldn't buy it often but I recognize it's American it's a fun novelty or comfort food for the homesick.

Based on that metric, I concluded there was a contingent of Europeans who viewed American peanut butter, BBQ sauce and hot porridge as superior enough to justify spending extra on. That spray cheese was correctly regarded as a disgusting novelty, and that pop tarts, lucky charms and marshmallow fluff are noveltys that are "fine".

Wouldn't have expected you to put relish there though! I kinda figured that was one everyone had that they tweaked a little for regional taste, like mustard.