Banana Nut Bread Muffins

Bananas are all over the place in the summer.  It felt wrong not to use them as much as possible!    I originally planned on making bread, but last minute made them into muffins.  Ben Schellack said they were pretty good, so I'll consider it quite the success.

I look at two recipes*, used them both, and somehow ended up with this:

I was a bit delayed on the crumble (wonk, wonk), but it worked.  summary of key ingredients?

brown sugar, cinnamon, walnuts, baking power + soda, an egg! and sour cream

*Janet's Rich Banana Bread + Banana Crumb Muffins