I made something similar with my friend Nicky during my A-levels so I thought I'd see if I could look for a recipe online. All the recipes use a chocolate topping rather than what I remember being a slightly gooey chocolate icing.
In the end I went for this recipe - (Adapted from here)
- 225g (8 oz) margarine
- 225g (8 oz) caster sugar
- 225g (8 oz) self-raising flour.
- 140g (5 oz) porridge oats
- 55g (2 oz) cocoa
- Icing sugar and 2 tsp cocoa powder for covering
Prep:15 mins | Cook:15 mins | Extra time:30min, chilling
In a large pan melt together margarine and sugar.
When sugar is completely dissolved remove from heat and mix in oats, cocoa and nuts. Mix in self-raising flour.
Turn into a 20x30cm (13x9 in) baking tray and press down well.
Bake at 180 C / Gas 4 for 15 minutes.
Cool then cover with chocolate icing. Chill to set.