Line a 12x18 inch jelly roll pan with aluminum foil.
Melt the dark or milk chocolate in 30-second intervals in the microwave, stirring after each melting, for 1 to 5 minutes depending on your microwave and don't overheat, or the chocolate will scorch. Stir in 2 tablespoons crushed peppermint.
Spread the chocolate evenly in the prepared pan and chill 30 minutes until set up.
Repeat the directions above by melting the white chocolate in 30-second intervals like above.
Again, stir in 2 tablespoons of the crushed candy canes.
Add marshmallows and stir until marshmallows are coated.
Spread the white chocolate mixture evenly over the milk chocolate.
Sprinkle the remaining candy cane pieces evenly over the white chocolate layer and chill until set, about 1 hour.
Break bark into small pieces to serve.