Preheat the oven to 180 degrees C. Grease a 20x30cm baking tray.
Slice: In a medium bowl mix together the butter/margarine, brown sugar and egg until smooth. Stir in applesauce. In a separate bowl combine the flour, bicarbonate of soda, salt and spices. Stir flour mixture into the applesauce mixture until well blended. Spread evenly into the prepared tray.
Bake for 25 minutes in the preheated oven, or until edges are golden. Put the tray onto a wire cake rack to cool.
Icing: In a medium bowl mix together the icing sugar and butter/margarine. Stir in the milk and vanilla until smooth. Spread over cooled slice before cutting into squares.
A lovely, light moist cake slice, I did add a little more of the spices. Instead of icing, I spread a smear of butter over the top of the slice straight from the oven and sprinkled cinnamon sugar on top. It was delicious warm from the oven with a cuppa and tasted just as nice when cooled. I am going to freeze some of it to have on hand for visitors....I'll see how it goes. - 24 Sep 2016