Preheat oven to 350. Coat an 8 inch square pan with cooking spray.
Mix sugar, salt and flour. Set aside.
In double boiler or microwave safe bowl, combine butter and half the chocolate chips. Melt, stirring often, then remove from heat. Whisk in the cocoa, transfer to a large mixing bowl and set aside.
In large measuring cup, whisk together eggs, vanilla and milk. Add this to the chocolate and cocoa mixture and whisk well to combine. Fold in the flour mixture, then add the remaining chocolate chips and all but 2 tablespoons of the crushed candy canes.
Transfer to prepared pan and sprinkle top with 1 tablespoon of crushed candy. Bake 45 minutes or until a toothpick inserted in the center comes out covered with cakey bits.