Preheat the oven

• Preheat the oven to 350°F (180°C).

Make the batter

• In a mixing bowl, combine the vanilla cake mix, oil, eggnog and egg.
• Mix until a thick batter forms.

Spread in the dish

• Line a 9x9-inch baking dish with parchment paper.
• Spread the batter evenly into the prepared dish.
• Top with the Christmas sprinkles.

Bake

• Bake until the edges are set and the center is cooked through.

Cool and slice

• Allow to cool completely before slicing into squares.