Mix cereal into milk; let stand 5 minutes. Meanwhile, mix flour, cinnamon, baking powder and baking soda; set aside. Mix egg with undrained pineapple and mashed banana. Thoroughly combine all three mixtures and stir in raisins. Spoon batter into a 24 muffin pan that has been sprayed with non-stick cooking spray. Bake in a preheated 375 degree oven for 30 minutes.