Hey mate,
Coopers have a few good ones on their site that are always winners and pretty simple to brew. Their best extra stout recipe is the following:
Size: 20L %Alc 6.8%
1 x Coopers Stout
1.5kg Dark Liquid Malt Extract
0.5kg Dextrose
Kit or Recultured Coopers Yeast
Although if you like really stouty stouts and keen to steep some grains:
Size 23L
SG: 1.058 %Alc: 6
FG: 1.015 IBU: 38.5
1x Coopers Stout
2kg Light Dried Malt
200g Roasted Barley
150g Choc Malt
100g Dark Crystal
Nottingham Yeast
Just avoid it getting hot >20 and it should turn out pretty well