Best Banana Bread - Adapted from Cook’s Illustrated: As noted below, toasted nuts, and a cinnamon-sugar topping are completely optional (although I think you’d be crazy to skip out on the cinnamon-sugar part). Feel free to add in anything extra–I love a good 1/2 cup of bittersweet chips thrown into the batter. Also, as always noted, make sure your bananas are really, really, really ripe for best results. It’s better to wait than end up with so-so banana bread.
Adjust oven rack to lower middle position and heat oven to 350 degrees. Grease bottom only of regular (not nonstick) 9-by-5 inch loaf pan, or grease and flour bottom and sides of nonstick 9-by-5-inch loaf pan; set aside. Combine first five (flour through walnuts, if using) ingredients together in large bowl; set aside.
Mix mashed bananas, yogurt, eggs, butter, and vanilla with wooden spoon in medium bowl. Lightly fold banana mixture into dry ingredients with rubber spatula until just combined and batter looks thick and chunky–it might look at first like there is too much dry ingredients and not enough liquid, but don’t fret! It will come together, just keep folding gently but consistently. Scrape batter into prepared loaf pan; sprinkle cinnamon-sugar topping evenly over top. Bake until loaf is golden brown and toothpick inserted in center comes out clean, about 55 minutes to an hour. Cool in pan for 5 minutes, then transfer to wire rack. Serve warm or at room temperature (or cold, I like that especially).