Banana Cookie Bars with Nutella Buttercream Frosting

Carson accuses me of letting bananas go bad.  And by the way, it's possible I've written that exact sentence on this blog before.  Ok so maybe I don't rush to eat them while they're edible.  Maybe I silently rejoice when I see them start to brown and ripen.  Maybe I google banana recipes like it's my job.  It is sort of my job, right?  It's my job.  Let's go with that.  

So I had two ripe bananas, and I found this recipe.  Gosh darnit, it's good.  I don't think you can possibly go wrong pairing bananas with Nutella, and these bars, while slightly dense, resemble a sugar cookie with delicious banana flavor.  You should let your bananas go bad, I think...