Smear 1 teaspoon of chocolate sauce around the inside of 2 tall glasses about 1-2 inches below the rim, not evenly using the back of a small spoon to spread it. Then place the glasses in the freezer for about 5-10 minutes.
In the blender add the milk, ice cream and chocolate sauce and blend until smooth. Pour into the glasses, top with whipped cream and drizzle with chocolate sauce or grated chocolate if desired. Enjoy!