Mix cake mix, oil, eggs, and vanilla together in a bowl.

The dough will be stiff but continue to mix until well blended. Refrigerate for 30 minutes.

Preheat oven to 350 and line a baking sheet with parchment paper.

Shape dough into tablespoon-size dough balls, I use a 1 tablespoon portion scoop and dip into sprinkles. Use a spoon to toss the dough in the sprinkles and coat all sides.

Place dough onto the prepared baking sheet, 2″ apart. Bake 9-11 minutes or until centers are set. Let cool completely.

Place 1/2 cup white chocolate or candy melts into a microwave-safe container and microwave according to package directions.

Place melted chocolate into a baggie, snip the corner and pipe white trees onto half of the cookies.

Refrigerate for 15 minutes or until chocolate is firm.