I keep calling this banana bread, although several tasters called it cake. Unlike most banana breads, this doesn't leave a film of grease on your fingers or in your mouth, which may be why it doesn't read as banana bread. It has a lovely crackly top, similar to a brownie, and a nice chewy texture. There's no oil or butter; all the moisture comes from banana and egg. Although I haven't tried making a vegan version yet, I think flax eggs would be a good egg substitute here, adding a pleasantly nutty flavor that would work well with the cinnamon.
This recipe is very close to the one on Orangette (Banana Bread with Chocolate and Cinnamon Sugar), which Molly Wizenberg got from Everybody Likes Sandwiches (Banana fana fo fana), which could be from Willie Nelson. I've given a specific measurement for the bananas, since I find they vary so much in size, reduced the cinnamon a bit, and swapped out the white flour for whole wheat flour. Normally I wouldn't go 100% whole wheat with a recipe right away, but I mixed up a batch one day when all I had was whole wheat. No-one who ate it noticed (and most of them had eaten the 100% white flour version previously). I recommend using the best chocolate chips you can - Ghiradelli 60% Cacao Bittersweet Chocolate Chips are my favorite for this recipe. For the sugar topping, I prefer turbinado or raw sugar to add a little more crunch, but regular white sugar works just fine.
Whole Wheat Chocolate Chip Cinnamon Banana Bread
Grease (or line with parchment paper) an 8" square pan or a loaf pan. Preheat oven to 375 degrees Fahrenheit.
Beat together the banana and eggs, then stir in the flour, sugar, baking soda, cinnamon, and vanilla. This will be a thick batter. Stir in the chocolate chips, and try to get them evenly distributed. Pour into the prepared pan. Sprinkle cinnamon sugar as evenly as you can manage over the top of the batter, then sprinkle the chocolate chips over that. Let it sit for about 10 minutes (this helps hydrate the whole wheat flour and make the final result fluffier). Bake for 35 - 40 minutes or until the internal temperature is about 201 degrees Fahrenheit. Let it cool in the pan, on a rack, for 15 minutes, then remove from pan. This is especially delicious while still warm!