Cut orange into 8 pieces. Put cut-up orange (that's right – the whole orange), orange juice, egg and oil in blender.
Blend until smooth.
Add flour, sugar, baking powder, baking soda and salt.
Blend until mixed.
Add raisins and nuts.
Blend just until mixed.
Pour mixture into muffin tins and bake at 375 deg.F (190 deg.C) for 15-20 minutes.