In a large bowl combine cheerios, rice chex, corn chex, small pretzels, chopped peppermint bark, and crushed candy canes. 

In a large glass bowl melted the white chocolate in 30 second increments in the microwave, mixing after each addition. Alternatively this can be melted in a double boiler on the stove. 

Add the melted chocolate over the cereal and stir together until all the ingredients are coated. 

Lay the batch out evenly on a large baking sheet lined with parchment paper. 

In a small glass bowl melted 1 cup of dark chocolate in the microwave. Drizzle this on the top of the batch evenly. 

Let the batch dry for an hour or so and then transfer to an air tight container.