Banana Sponge Cake

recipe from Mimosa's Diary [A] 200g mash banana 3 eggs 100g sugar 150 g plain flour 1/2 tsp baking powder 1/4 tsp bicarbonate of soda 100 ml melted butter / canola oil (i uses melted butter) Method Beat [A] for 5 minutes until thick (ribbon stage) Add in flour, baking soda, baking powder Stir in melted butter / oil Bake at preheated oven 160 C for 40 minutes