Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper or grease it lightly.

In a mixing bowl, combine the cake mix, eggs, vegetable oil, and vanilla extract. Stir until a soft dough forms.

Fold in half of the sprinkles, white chocolate chips, or M&M’s (if using).

Scoop tablespoon-sized balls of dough and place them about 2 inches apart on the prepared baking sheet.

Slightly flatten each dough ball and add extra sprinkles on top for decoration.

Bake for 9-11 minutes or until the edges are set and the centers are still soft.

Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.