Peel orange; place peel in a blender or food processor. Separate orange into segments; place in blender. Add orange juice; cover and process until well blended. Add butter and egg.
In a large bowl, combine the flour, sugar, baking powder, baking soda and salt. Stir in orange mixture just until moistened. Fold in raisins.
Fill greased or paper-lined muffin cup two-thirds full. Bake at 400° for 15-20 minutes or until a toothpick comes out clean. Cool for 5 minutes before removing from pan to a wire rack.