Preheat your oven to 350°F (175°C).
Grease a 9x13-inch baking dish with butter.
In a large bowl, combine the cubed bread and raspberries.
In another bowl, whisk together the milk, cream, eggs, sugar, vanilla, cinnamon, and salt.
Pour the milk mixture over the bread and raspberries, ensuring everything is soaked.
Let it sit for 10 minutes to absorb.
Pour the mixture into the prepared baking dish.
Bake for 45 minutes or until the top is golden brown and set.
Allow to cool slightly before serving.
Serve warm with a drizzle of cream or a dusting of powdered sugar.