Beat eggs and sugar, add baking powder, vanilla, and flour. Add the dates last and mix thoroughly. Batter will be thick. Pour into a greased 8x8 pan and bake at 180ºC or 25 to 30 minutes. When cooled sprinkle icing sugar over the top and rub in until completely coated with icing sugar.
Note: Can be doubled and baked in a 9x13 pan. Takes about 10-15 minutes longer.
Or use candied fruit that is available at Xmas in place of the dates.
To make it real fancy, use a paper doily before sprinkling the icing sugar on top.