Banana and Chocolate Chip Upside Down Cake

I'm happy to be taking care of two things with this recipe. One is that about a week ago, I was late to the market, arriving near the end, when everyone was packing up to leave. Scanning quickly to see what I could procure in a short amount of time, I passed by a stand when one fellow had an enormous pile of organic bananas, and he was hollering, "Un euro, deux kilos!...Un euro—deux kilos!"

Since that's roughly a buck for a little over four pounds of fruit, I stopped right there, and...