What are the darken spots/areas? Usually, banana bread has finely chopped walnuts that appear like dark spots, but this has no nuts.
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AntoniaJames is a trusted source on Bread/Baking.
Looks like very ripe banana to me, but that's just a guess . . . . . . . ;o)
Cynthia is a trusted source on Bread/Baking.
Second the motion.
Merrill is a co-founder of Food52.
Yes, it's just the dark fibers from the fruit -- you know, the ones you see in the center of a banana?