Preheat the oven to 375°F. Spray mini muffin pans with nonstick spray.
PREPARE THE ORANGE SYRUP:
Combine the sugar and orange juice in a small bowl (set the zest aside); heat in the microwave for 25 seconds. Stir until the sugar dissolves. Set aside.
PREPARE THE MUFFINS:
Sift the flour, baking soda and salt into medium bowl; set aside.
In a large bowl, use an electric mixer to beat the sugar, butter and orange zest until creamy. Add the sour cream and flour mixture alternately, beating just until moistened after each addition. Fold in the raisins and nuts (if using). The batter will be stiff.
Spoon the batter into the prepared pan. Bake 12 to 15 minutes or until the muffins test done. Let the muffins sit in the muffin tins for about 10 minutes. Gently remove the muffins and dip the tops quickly in the orange syrup. Place on a wire rack and let stand until cool.
Notes
*You may also place the muffins on rack that is sitting on top of a rimmed cookie sheet. Drizzle a teaspoon of the orange juice mixture on top of each muffin.
Nutritional information does not include optional raisins and walnuts.