Dreamy Chocolate Torte

This is decadently rich.  I made this up for a New Years Eve party.  The centre is very soft and it is almost like a molten cake.  The original recipe called for chocolate whipping cream but I just used regular as I thought it would offset the rich cake a little better.

4 oz bittersweet or dark chocolate, chopped
2 oz milk chocolate, chopped
3/4 cup salted butter
1 3/4 cups granulated sugar
1/2 tsp salt
4 eggs
1 tbsp vanilla extract
3/4 cup cocoa powder
3/4 cups whipping cream
chocolate curls or additional cocoa powder

1. Preheat oven to 375 F.  Butter a 10 inch springform pan and line with a round of parchment paper.
2. Melt bittersweet chocolate with milk chocolate and the butter in a large heavy saucepan wset over low heat until smooth.  Remove from heat; whisk in sugar and salt, followed by eggs and vanilla.  Sift cocoa powder over chocolate mixture; stir until combined.
3. Scrape batter into prepared pan.  Bake for 25 to 30 minutes or until top has a thin crust and the edges pull away from pan.  Cool on a rack for 10 minutes.  Run a thin knife around edge of cake; carefully invert onto a serving plate and remove parchment paper.  Cool completely.  
4. Beat whipping cream until very stiff.  Mound whipping cream onto centre of cake just before serving.  Garnish with chocolate curls or a dusting of cocoa.  Makes 20 servings.