Preheat oven to 350 degrees. Grease an 8x8 baking pan and set aside.
In a large bowl, combine cake mix and sprinkles. Stir in coconut oil, milk, and egg, mixing well to combine. Stir in white chocolate chips. Batter will be thick.
Spread batter into prepared baking pan. Bake in the preheated oven for 30-35 minutes, or until toothpick inserted in center comes out clean.