If you can’t find Immaculate brand, feel free to use other ready-made golden or vanilla cake mixes. Replace the amount of water on the package instructions with eggnog. Substitute equal parts melted butter and grapeseed oil with the listed vegetable oil amount. Also, you will want to use the number of whole eggs your mix calls for (Immaculate uses 4 eggs but most call for 3). Finally, add 1 tablespoon of rum to the batter, and you’re ready to bake!