Preheat your oven to 375 degrees Fahrenheit.
Cut your bread into bite-sized cubes.
Place them in a large baking dish.
In a large mixing bowl, combine the milk and melted butter.
Mix thoroughly.
Add the sugars, beaten eggs, vanilla extract, cinnamon, bourbon, and salt.
Pour the milk mixture evenly over the bread cubes in the baking dish.
Let it soak for about 15 minutes to ensure the bread absorbs the liquid.
Cover the dish with aluminum foil.
Place it in the preheated oven.
Bake for 30 minutes.
Remove the foil.
Bake for an additional 15 minutes or until the top forms a golden, crispy layer.
Serve warm.