No-bake peanut butter jelly tiramisu jars layered with banana, jelly-brushed ladyfingers, and whipped peanut butter mascarpone cream.
Warm the jelly just until pourable, not hot — hot jelly will melt the cream layer on contact. If your jelly is very stiff, add water 1 teaspoon at a time rather than all at once. Jars keep well covered in the fridge for up to 3 days, though the peanuts are best added right before serving to stay crunchy. Freeze-dried banana chips, crumbled, make a good stand-in for fresh banana if you want a longer shelf life.