Chocolate Mousse Cake

Directions

1. 1
   chocolate and butter in small saucepan. Cook over low heat, stirring frequently, just until chocolate melts. Pour into large bowl; cool to room temperature.
2. 2
   egg whites until foamy in medium bowl with mixer at high speed. Gradually add sugar, beating until soft peaks form. Add egg yolks to chocolate mixture; stir until blended. Stir in corn starch.
3. 3
   egg whites into chocolate mixture until thoroughly blended. Pour into a greased 9-inch springform pan that has been lightly dusted with corn starch.
4. 4
   in preheated 300°F oven 40 to 45 minutes or until set. Run knife around edge immediately after removing from oven.
5. 5
   on wire rack. Remove side of pan. Sprinkle with powdered sugar.