Preheat your oven to 350°F (175°C).
In a mixing bowl, combine the cake mix, egg, and vegetable oil until well blended.
Stir in the white chocolate chips and vanilla extract until evenly distributed.
Add baking powder and a pinch of salt, mixing until just combined.
Scoop tablespoon-sized amounts of dough onto a lined baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for about 10-12 minutes, or until the edges are set but the centers still look soft.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.
