Preheat the oven to 180°C, gas mark 4. Line a greased 20cm x 20cm tray with baking paper
Melt together the butter and cocoa – mix well and add the avocado
Beat together the eggs and the soft brown sugar until it is light and foamy. Stir the melted butter, cacao and avocado mixture into the egg mixture
Mix together the self-rising flour, chilli flakes and the salt in a separate bowl
Fold the flour mixture into the chocolate mixture and mix well.
Pour the batter into the prepared tray and bake for 20-25 minutes (until it is almost set but not completely). Leave to cool completely in the tray, preferably in the fridge
Cut into portions and remove from the baking tray
Drizzle with dark chocolate and garnish with malted puffs