Spray a 9x13 baking dish with non-stick cooking spray.
Place bread cubes in baking dish.
In a large bowl, whisk together eggs, milk, vanilla, sugar, cinnamon and salt.
Pour mixture over top of the bread cubes.
Cover and refrigerate over night.
Preheat oven to 350 degrees.
Bake for 40-50 minutes or until casserole reaches desired doneness.