Add all of the bread to the baking dish to make sure that all of it fits. Remove the bread and then spray the 2.5 quart baking dish. This can be an 8 x 11 baking dish or a casserole dish. Set aside.
In a bowl mix whisk the eggs. Then add the milk, half and half, vanilla, salt, ¼ cup maple sugar, ½ cup of brown sugar, and 2 tablespoons of bourbon and whisk to combine.
Add the bread to the egg mixture and gently mix to coat all of the bread. Add the bread to the sprayed baking dish.
Bake for 45 minutes or until there is no more liquid in the dish. Remove from the oven.
Making the bourbon sauce
While the bread pudding is baking. In a sauté pan heat the butter, the remaining bourbon, brown sugar, and maple syrup. Bring to a boil and stir occasionally to prevent burning. Reduce the heat to medium and cook for another 5 minutes.
Pour over the bread pudding.
Notes
If you want some of the bourbon still in the sauce reserve a tablespoon or two of the bourbon. Cook the sauce for a couple minutes more and then before serving mix in the remaining bourbon back into the sauce. If you don't cook with alcohol then you can remove it completely from the sauce and bread pudding.