*Mix the first 4 ingredients together in a mixing bowl. Next whip the heavy cream & ½ pound powdered sugar in a mixer until thickened. Gently fold the sour cream mixture into the whipped cream. Layer sliced strawberries with the sour cream/whipped cream mixture in a large glass triffle bowl ( a quarter of the way stand the lady fingers up the sides of the bowl. Finish off with extra whipped cream.