Base:

250g butter
1 cup sugar
2 cups flour
2 tsp baking powder
4 tbsp cocoa

Topping:
1 can sweetened condensed milk
50g butter
2 tbsp golden syrup

Cream butter & sugar. Sift flour, baking powder & cocoa. Add to creamed mix and blend well. Press into two sponge roll tins. Melt butter and golden syrup, mix in condensed milk. Spread over uncooked mixture in tin. Bake at 180°C for 20 minutes. Cover with chocolate icing while still warm. Cut into squares when cold.