1 cup semisweet chocolate chips
1 packet instant hot chocolate mix (2 tbsps. loose mix)
2 tablespoons sugar
1/4 cup cream
1 and 1/3 cup milk
3 cups ice cubes
For Whipped Cream:
1/2 cup whipping cream
1 tablespoon sugar
1/2 teaspoon vanilla
In a small saucepan, melt chocolate over very low heat. Whisk in hot chocolate mix, sugar, and cream until smooth. Whisk in milk and transfer mixture to blender. Add ice and process until smooth. Meawhile, beat whipping cream until fluffy; stir in sugar and vanilla. Serve frozen hot chocolate with whipped cream, and if you're cleverer than I, you can add some chocolate shavings, too.
Notes: I'm sure that you'll get the best results with high quality chocolate, but all I had was chocolate chips and they were delicious, too. I used Nestle hot chocolate mix, but any kind would work.