Fudgy Banana Bars with Vanilla Bean Browned Butter Glaze

"Fudgy is the only word that describes the bars. They’re the banana equivalent of moist, fudgy brownies with zero traces of cakiness. The bars are rich, soft, supremely moist, and tooth-sinkingly dense and satisfying. If you’re looking for a fluffy slice of banana cake or banana bread, they’re not that. It’s an easy, no-mixer recipe and the glaze makes the bars go from really darn good to out-of-this world amazing. It’s a must-make. The secrets are browned butter and glorious specks of vanilla beans. I used vanilla bean paste but scraping the seeds of a vanilla bean works. Vanilla extract is okay but won’t be as flavorfully intense. The glaze seeps into the bars, and makes them even moister and softer...."