Preheat oven to 350 degrees F. Grease and flour 13 x 9 x 2-inch pan.
For filling, combine contents of cocoa packet from mix, 1/4 cup cake mix, cream cheese and melted chocolate in large bowl. Beat at high speed with electric mixer for 2 minutes. Add eggs and cream. Beat at high speed for 1 minute. Set aside.
For crust, stir remaining cake mix and melted butter in medium bowl. Mixture will be crumbly. Sprinkle mixture into pan. Pour filling over mixture.
Bake at 350 degrees F for 30 to 35 minutes. Cool in pan. Refrigerate until chilled. Garnish individual servings with dollops of whipped cream and strawberries.