From the Edmonds book;
125g butter, 175g sugar, 2 eggs, 225g flour, 1 tsp baking powder, 2tbsps boiling milk, 1 tsp bicarbonate of soda, 2 mashed bananas. Cream butter and sugar, add eggs and mashed banana. Dissolve the 1 tsp bicarbonate of soda in the boiling milk then add to the mixture. Lastly add flour and baking powder. Pour mixture into two greased sandwich tins. Bake at 180 degrees for 20 mins.