Gluten-Free Banana Bread with Chocolate and Walnuts

Since I am clearly incapable of throwing away even the blackest banana, I have spent much of my life making banana bread, and am always happy to find an excuse to come up with another one. A friend of mine had been begging me for ages for a gluten-free version, and this is it. The crumb is tender and light – the Greek yogurt helps here, and also counters the sweetness of the banana with its tang – and the nubbliness of the walnuts and rich goo of the chopped chocolate make it a gorgeous tre