Adjust the oven rack to the middle position and preheat the oven to 450 degrees Fahrenheit.
Arrange the bread in a single layer on a baking sheet until crisp and browned, about 12 minutes, turning pieces over and rotating the sheet halfway through baking. Let the bread cool.
In a large bowl, whisk together the cream, milk, evaporated milk, light brown sugar, granulated sugar, vanilla extract, bourbon, salt, cinnamon, nutmeg, melted butter, eggs, and egg yolks.
Add the toasted bread cubes to this custard mixture. Gently toss until the bread is completely coated. Cover the bowl and let it soak for 30 minutes. Gently push the bread down into the custard occasionally to ensure it's thoroughly soaked.
Preheat the oven temperature to 300 degrees Fahrenheit and butter a 13 by 9-inch broiler-safe baking dish.
Pour the bread and custard mixture into the prepared baking dish. Sprinkle turbinado sugar over the top of the custard. Bake in the preheated oven until the custard is set and the top is golden brown, about 1 hour 15 minutes to 1 hour and 30 minutes.
Let the bread pudding cool slightly before serving.