01 -
Preheat the oven to 350°F (175°C). Grease and line a 9x5-inch loaf pan. Beat the cake mix, eggnog, butter, eggs, rum, and nutmeg until smooth, then bake for 55-60 minutes, or until a tester comes out clean.
02 -
Let the cake cool in the pan for 15 minutes, then move it to a rack and cool completely. Crumble the cooled cake into fine crumbs in a large bowl.
03 -
Mix in 3/4 cup frosting at first. Add more only if needed, 1 tablespoon at a time, until the mixture holds together when pressed but does not feel wet.
04 -
Scoop 1 tablespoon portions and roll into smooth 1-inch balls. Arrange on a parchment-lined baking sheet and chill for at least 2 hours, or until very firm.
05 -
Melt the chocolate wafers in a microwave-safe bowl in 20-30 second bursts, stirring between each burst. If the coating is too thick, stir in a little coconut oil or shortening.
06 -
Dip a few chilled cake balls at a time in the melted chocolate. Lift with a fork, tap off excess coating, and set on parchment. Drizzle with melted white chocolate and add flaky salt, nutmeg, or sprinkles while still wet.
07 -
Chill the dipped cake balls for 30 minutes, or until the coating is firm. Store covered in the refrigerator until ready to serve.