The casserole turned out perfect. It was the first time I had made something like it, and I was so pleased with the results. I picked up a fresh loaf of brioche bread from the market, which smelled incredible. I think the key to a good French toast is having a really good loaf of brioche.
I've made this recipe with both dark and milk chocolate. Each is unique in flavor, and really, it's up to you to choose your favorite. Once you've rolled out the dough into a tight tube, and carefully sliced it into perfectly beautiful rounds, your natural instinct is going to be to place them neatly and tightly into a large pan, where they can rise and puff into each other.