In a large bowl, mix flour, sugar, raisins/nuts, oats, baking powder, salt, and cinnamon. In a separate bowl, mix eggs, zucchini, and oil. Stir zucchini mixture into flour mixture just until flour mixture is moistened. Do not overmix. Fill greased muffin tins 2/3 full. Bake for 15 to 20 minutes.