So far I have come across two varieties, one just plain banana flour and the other with something added, (not on label) but smells like could be vanilla. (glutenfreeandmore.com)
Alternate Nutella batter with plain banana bread batter into the same pan. (warmvanillasugar.com)
When I think about the days I used to eat plain banana ice cream with just a blob of nut butter or sprinkle of chia seeds, I can't help but LOL. (katalysthealthblog.com)