* You can use half-and-half in place of all or some of the whole milk if you’re feeling like something extra-decadent.
** Cardamom should always be used with restraint, but feel free to use a little more if you really love its flavor. Just be careful not to go overboard (you can always sprinkle a little more in with the powdered sugar at the end).
To make ahead and store: The best way to make this ahead of time is to prep the two components, and then bring them together at the last moment. Combine the wet ingredients and store in the fridge for a day or two. Toast the bread cubes, and keep at room temperature in a sealed container (or the casserole dish, covered) for a day or two. When you’re ready to bake, preheat the oven, spread the bread cubes in a greased casserole dish, top with the wet ingredients, let it sit for 15 minutes, and proceed with the recipe.