01 - Preheat the oven to 350°F. Grease a 9x13-inch baking dish with butter.
02 - Spread the bread cubes evenly in the prepared dish. Sprinkle raisins evenly over the bread.
03 - In a large bowl, whisk together eggs, milk, cream, sugar, vanilla, cinnamon, nutmeg, and salt until well combined.
04 - Pour the custard mixture evenly over the bread and raisins. Press gently to submerge all the bread in the liquid. Let sit for 10 minutes to allow the bread to soak.
05 - Bake for 40 to 45 minutes, or until the custard is set and the top is golden brown.
06 - Remove from oven and allow to cool slightly before serving. Serve warm, optionally with a dusting of powdered sugar or a drizzle of vanilla sauce.