1. Begin by dissolving your chosen Jell-O flavor in 1 to 1.75 cups of boiling water, stirring consistently until the powder is fully dissolved.
2. Add the cold water and freshly squeezed orange juice to the mixture to help cool it down.
3. Stir in the crushed pineapple, including its juice, and the whole berry cranberry sauce to incorporate the main flavors of the salad.
4. If desired, mix in the chopped nuts as well as any optional add-ins, such as apple slices, celery, or halved grapes, for added texture.
5. Transfer the mixture to a serving dish and smooth it out evenly using a spatula to ensure it sets uniformly.
6. Place the dish in the refrigerator and allow it to chill for at least 3 to 6 hours, or preferably overnight, for optimal firmness and flavor melding.
7. Before serving, top the salad with heavy whipping cream or a cream cheese mixture if desired. Add additional chopped nuts or other garnishes like whipped cream, fresh cranberries, or mint leaves for a decorative touch.
8. Serve the Cranberry Jello Salad as a vibrant and flavorful holiday side dish.