At the risk of sounding redundant: the combination of chocolatey, nutty, and sweet flavors complement each other so well.
You can take this sandwich in two directions:
1. Add some strawberry slices if you want to offset the richness with something acidic and bright.
2. If you want to really indulge, pull an Elvis Presley and throw some bacon on there for a salty element to complement the sweetness.
