Mix banana, oil, milk in food processor, then mix in 2 eggs, set aside
Mix flour, sugar, BP and salt in a bowl, pour in wet ingredients, to just combine
Fold in raisin, choc chips and walnuts
Bake on preheated 350 F for 40-55mins depending on your oven or until knife inserted comes out clean (using silicon normally as given times, however with aluminum baking pan takes longer).