Lightly spray a 9x13 baking dish with non-fat cooking spray.

Cut entire loaf of challah into 1 inch cubes, and place bread cubes into baking dish,

In a large bowl, whisk together milk, egg substitute, pumpkin puree, vanilla extract, pumpkin pie spice, and pumpkin butter until well combined.

Pour egg mixture over bread cubes, pushing down with a spoon, until all bread is soaked and mostly covered.

Cover dish with saran wrap and refrigerate overnight.

In the morning, pre-heat oven to 350 degrees.

Put baking dish into oven and bake for about 30 – 45 minutes.

Cut into 8 servings, and top each serving with 1 tbsp maple syrup.