Banana-walnut muffins (or banana nut muffins!) were the most popular treats during our vacation on the West Coast of the U.S. (San Francisco, the national parks, Death Valley, Las Vegas, …). Before setting off on a long trip (the open spaces, for those who’ve never been there, are veeeery vast), we’d always stock up on provisions and water, and treat ourselves to a few sweets. The selection was vast, but in the end we always chose the banana and walnut muffins: they leave a delicious taste in your mouth,