Just made this and it turned out so well I just had to share! It made a low, fairly moist, rich slice - delicious!

Slice
125g melted butter
1 cup dextrose
1 lightly beaten egg
1 teaspoon imitation vanilla essence
3/4 cup plain flour
1/4 cup self raising flour
2 tablespoons cocoa

Icing
1/2 cup dextrose
2 tablespoons cocoa
20g melted butter
hot water
(combine dextrose, cocoa and butter, add enough hot water to make it spreadabl - is fairly coarse)

1. grease slice pan and line sides and base with baking paper, pre-heat oven to 180C
   
2. combine butter, dextrose, vanilla essence and egg
3. stir in sifted flours and cocoa.  If not wet enough add milk gradually (I used about 1/8 cup)
   
4. spread over slice pan
5. bake for approx 25 min or until firm to touch (I did 21 min)
   
6. Spread hot slice (still in pan) with icing and sprinke with coconut if desired (blerg - hate the stuff!)
7. Cut when cool and store in an airtight container

This is the first thing I've baked since changing our lifestyle.  We love it.  I used all SR flour, as that's what I had on hand.  Our 'non believing' friends were amazed that something without sugar could taste so good.  Next time I'm going to add some peppermint essence, just to mix it up a bit. :)