Make double boiler by filling an inch of water in a pot and place a glass bowl inside the pot. Melt the white chocolate in the glass bowl, stirring continuously.
Turn off heat and add cream cheese and milk. Stir until everything is melted together.
Measure out chex mix.
Pour chocolate mixture over chex mix and stir until chex is fully coated.
In a separate bowl mix together red velvet box mix and powdered sugar.
Top chex with red velvet mixture.
Cover and shake. (We split ours in two bowls so both of my girls could shake the puppy chow.)