Lightly beat the egg white in a small bowl. In a large bowl, mix together cocoa, chocolate bliss, vanilla dream, and cornstarch. Add 3/4 cups of the milk and whisk mixture until it’s smooth. In a large saucepan, mix together the rest of the milk, the stevia and the salt. Bring to a boil over high heat, whisking continuously. Remove from heat. Whisk the cocoa mixture into the milk mixture. Bring to a boil over medium-high heat. Boil for 2 minutes while whisking continuously. Remove from heat. Slowly whisk 1 cup of the hot cocoa mixture into the egg whites. Pour this mixture back into the pan and cook over medium-high heat, whisking continuously and being careful not to allow the mixture to boil. Remove from heat. Mix well. Pour into 2 serving dishes. Cool to room temperature. Refrigerate for 1 hour. Garnish with berries, mint leaves or cocoa.