Pour your Chex into a large bowl.
Carefully melt your white chocolate. You can do it in the microwave but stir frequently so that it doesn’t burn.
Once it is melted, pour it on your Chex and stir until the cereal is totally coated.
Now mix your powdered sugar and cake mix and then pour that over the cereal mixture. Stir till evenly coated.
Add your sprinkles and you are set!