If a jar of peanut butter gets more love (or abuse) in a season other than summer, we haven't seen it. Camp sandwiches on camp sandwiches on camp sandwiches, PB&J till the cows come home. (Not that we're knocking PB&J.)
When the jar gets down to the two-fingers'-worth line—not enough for a sandwich—what to do, besides the perfectly reasonable solution of eating it straight from a spoon?
Make a dressing out of it. Miso + peanut butter + chili sauce + apple cider vinegar for pasta salad, peanut butter + soy sauce + Sriracha + fish sauce for udon noodles or dipping. Soy sauce + garlic + sherry vinegar and you've got a marinade for tofu (or anything else).
You are never too old for ants on a log! It also happens to make a weirdly perfect midnight snack.