Preheat oven to 350 degrees. Butter or spray non-stick cooking spray on a 9x13 baking dish. Place the torn up bite-sized pieces of bread into the baking dish, spreading them all over. In a medium-sized mixing bowl, whisk together the eggs, milk, heavy cream, bourbon, sugar, salt, cinnamon, and nutmeg. Pour the mixture on top of the bread. Bake for 1 hour.