Heat the oven to 350°F (175°C) and line two baking sheets with parchment paper. Stir together cake mix, eggs, oil, and vanilla until a thick dough forms, about 1 minute.

Fold in white chocolate chips. Drop tablespoon sized mounds of dough onto the sheets, 2 inches apart. Bake 9 to 11 minutes until edges are set and centers look soft.

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