[header] How to upgrade peanut butter and jelly [title] Use a different nut butter. [step] If you want to make a simple swap that will give your sandwich a dramatically different taste, swap a different nut butter for the peanut butter. You could use cashew, almond, sunflower, or hazelnut butter. 
Many of these are available in creamy or crunchy varieties. [substeps] You could use a chocolate-hazelnut or chocolate-cashew spread for an even richer filling.