Judy's infamous recipe for Bakeless Chocolate Cake Marie biscuits are a cookie that is crisp but not too sweet. I would use vanilla wafers if I couldn't find Marie Biscuits. Note , sultanas are a plump and moister raisin that is used in New Zealand and Australia.
Place biscuits in a bowl, melt butter, sugar, cocoa in a pan over medium heat .
Bring to boil . Add beaten egg, walnuts and sultanas or raisins Add to the crushed biscuits and mix quickly . Tip into greased flat tin. Cut into small pieces.