Grease 16 Muffin cups; set aside. Preheat oven to 400. In a large bowl, combine flour, sugar, b. Powder, and salt. Add oil, milk, and bananas: stir until just combined. Stir in chocolate pieces and walnuts. Spoon into prepared muffin pan, filling each 2/3 full. Bake 20 to 25 minutes. Serve warm.
