Heat oven to 400ºF. Line baking trays with parchment paper, set aside.
Place crushed candy canes in a small bowl & set aside.
Cream together 1½ cups sugar, the butter, shortening and eggs in large bowl.
Mix together dry ingredients. Stir into wet ingredients.
Shape dough into 1¼-inch balls. Dip 1/2 of each ball in the crushed candy canes.
Place 2 inches apart on baking sheets.
Bake 8 to 10 minutes or until set. Cool 2-3 minutes, then transfer to a wire rack.
Drizzle each cooled cookie with the melted white chocolate & then sprinkle with additional candy cane crumbs