In a large mixing bowl, combine Crisco, sugar, egg, and cake batter flavoring. Beat until light and fluffy.

In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add to the wet ingredients, mixing until just combined.

Stir in the sour cream and mix well until a soft dough forms.

Lightly flour a clean surface and roll out the dough to about ½-inch thickness. Use your favorite holiday cookie cutters to cut the dough into festive shapes.

In a small bowl, mix powdered sugar with a little bit of milk, adding just enough to create a thick, spreadable consistency. The icing should be thick enough to cling to a spatula without running off. Add flavoring of choice for extra depth.

Spread or pipe the icing onto the cooled cookies and let it set before storing.