Alternatively you can drizzle the white chocolate over the Chex mix like this: Pour white chocolate chips into zip-loc bag. Place in microwave for 20 seconds and use fingers to mix. Repeat until white chocolate is melted. Cut a small corner off of the bag and drizzle white chocolate over cereal mix. Let stand until chocolate sets.
My family adores this Chex mix as is but I think it would be fun to mix in some nuts and/or dried apple pieces.