Creating this Eggnog Bread Pudding is a delightful and straightforward process. Follow these steps to ensure success:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or non-stick spray.
2. Prepare the Bread: Place the cubed bread in a large mixing bowl. If you prefer a crispy top, let the bread sit out for a bit to dry.
3. Mix the Custard: In a separate bowl, whisk together the eggs, eggnog, milk, granulated sugar, vanilla extract, cinnamon, nutmeg, and salt until well combined.
4. Combine: Pour the custard mixture over the bread cubes, making sure all pieces are soaked. Let it sit for about 10 minutes to allow the bread to absorb the custard.
5. Add Optional Ingredients: If using, fold in the raisins or dried cranberries for added texture and sweetness.
6. Transfer to Baking Dish: Pour the bread mixture into the prepared baking dish, spreading it evenly.
7. Bake: Bake in the preheated oven for 45-50 minutes, or until the top is golden brown and a knife inserted in the center comes out clean.
8. Cool: Remove from the oven and let it cool for 15-20 minutes before serving. This will help the pudding set further.
9. Serve: Cut into squares and serve warm with whipped cream or a scoop of vanilla ice cream, if desired.

These steps will guide you through the process of making this incredible Eggnog Bread Pudding, ensuring a delicious result every time.