Follow these simple steps to create your own Decadent Eggnog Bread Pudding:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
2. Prepare Bread: In a large mixing bowl, combine the cubed bread and melted butter, tossing to coat evenly.
3. Mix Wet Ingredients: In another bowl, whisk together the eggnog, eggs, sugar, vanilla extract, nutmeg, and cinnamon until well combined.
4. Combine Mixtures: Pour the eggnog mixture over the buttered bread, ensuring that all pieces are soaked. If using, fold in the raisins or cranberries.
5. Let it Sit: Allow the mixture to sit for about 15-20 minutes, letting the bread absorb the liquid.
6. Transfer to Baking Dish: Pour the bread mixture into the prepared baking dish, spreading it evenly.
7. Bake: Place the baking dish in the preheated oven and bake 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 about 15 minutes before serving.
9. Serve: Serve warm, topped with whipped cream or a scoop of ice cream if desired.

These straightforward steps will guide you in creating a delightful Decadent Eggnog Bread Pudding that will become a cherished recipe in your holiday repertoire.