Using an electric mixer, cream together the butter and sugar.
Beat in the salt and flour until it is well combined and has an even consistency.
Mix in the crushed candy canes.
Roll the dough out on a floured surface to a 1/4 - 1/2 inch thickness. Cut cookies with 2 inch round cookie cutters.
Place on a baking sheet lined with parchment paper. Sprinkle with the 1 tbsp of sugar. Bake in a 325F oven for 12-15 minutes. The edges should just start getting brown.
Remove from the oven and place on a wire rack. Cool completely.
Melt the white chocolate and shortening. Drizzle on the cookies.
Store in an airtight container for 2 weeks or in the freezer for up to 3 months.