Mix in a bowl Crumpled bananas, fat, eggs, milk and sugar and whip well. Sift flour with baking powder, salt, cinnamon and add to wet mixture. Stir the two mixtures to homogeneity and add the walnuts and chocolate. The mixture Pour into greased and floured form or on a baking sheet and bake in the oven, which is heated to 180 C for about 50 minutes. Ready samples with a wooden stick. Subtract cake and still hot, sprinkle with powdered sugar.