This recipe for banana muffins comes from the same Thomas Keller cookbook, Bouchon Bakery, that I’ve been making a lot of baked goods from. The recipe is pretty exact but not very difficult and if you follow it step by step, you will be sure to have great results.
Keller suggests resting the batter overnight. This allows the flour to hydrate, or absorb the liquid which results in an extra moist muffin. This is also a great idea because you can make the batter the night before and it will be ready to pop in the oven in the morning.