Peanut butter and jam (or jelly, if you must) together is a combination without parallel. It’s not just the juxtaposition of salty and sweet, or of creamy and tart, or of dense and light — it is all of these things, and something more.
Personally I always thought peanut butter and jam was gross and peanut butter and honey was where it’s at, and while honey and everything to do with it will always hold a special place in my cupboard, since I tried PB&J two years ago everything has changed. Honey is too subtle, too potentially cloying; jam can survive being smothered with peanut butter and adds flavour that contrasts instead of blends. Just like in these recipes! (See what I did there.)
You have to crawl before you can walk.