- 8 tablespoons butter (4 ounces), softened
- 1 cup eggnog
- 1/4 cup rum, or use 1/4 cup more of the eggnog with 1 teaspoon rum flavoring
- 1 teaspoon ground nutmeg
- 2 teaspoons vanilla
- 3 large eggs
- 1 package (18.25 ounces) white cake mix
Beat butter until light; beat in eggs and eggnog and rum or rum flavoring. Add vanilla, nutmeg, and cake mix; beat slowly to combine, then beat on high speed for 2 minutes. Spoon into the prepared baking pan. Bake for 35 to 45 minutes, or until a cake tester or wooden pick comes out clean when inserted in the middle of the cake.
Cool in the pan on a rack for 15 minutes. Invert the cake onto a serving tray and cool completely before frosting or dusting with powdered sugar.