Preheat oven to 400 degrees.
In a bowl, combine baking mix, 2/3 c sugar, and cocoa.
Stir in milk and butter; mix well.
Drop by 1/3 cupfuls at least 2 inches apart onto a greased baking sheet.
Beat egg white until foamy; brush over shortcakes.
Sprinkle with remaining sugar.
Bake 15 - 18 minutes.
Cool on wire racks.
Set aside 10 whole strawberries; slice remaining strawberries.
In a mixing bowl, beat cream and powdered sugar until soft peaks form.
Just before serving, split shortcakes horizontally.
Spoon half of the whipped cream and all of the sliced berries between cake layers.
Spoon remaining whipped cream on top.
Drizzle with chocolate syrup; top with a whole berry.