Creating Festive Cinnamon Swirl Eggnog Bread Pudding is a delightful process. Follow these simple steps for success:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish with cooking spray or butter.
2. Prepare Bread: In a large mixing bowl, combine the cubed bread, raisins or cranberries, and chopped nuts if using. Toss to combine evenly.
3. Mix Wet Ingredients: In another bowl, whisk together the eggnog, eggs, sugar, vanilla extract, cinnamon, nutmeg, and salt until well combined.
4. Combine Mixtures: Pour the eggnog mixture over the bread cubes, ensuring all pieces are soaked. Allow it to sit for about 10-15 minutes, stirring occasionally.
5. Transfer to Baking Dish: Pour the bread mixture into the prepared baking dish, spreading it evenly. Drizzle the melted butter over the top for added richness.
6. Bake: Place the baking dish in the preheated oven and bake for 45-50 minutes, or until the top is golden brown and a toothpick inserted in the center comes out clean.
7. Cool: Once baked, remove from the oven and let the bread pudding cool for about 15 minutes before serving. Dust with powdered sugar if desired.

These steps will guide you in creating this incredible Festive Cinnamon Swirl Eggnog Bread Pudding effortlessly. Enjoy the process and the delightful aromas that fill your kitchen!