Preheat oven to 350 degrees F (175 degrees C). Lightly grease a baking sheet.
In a large bowl, cream together sour cream, butter, and sugar in a mixing bowl.
Add the 1/2 egg, and beat until fluffy.
Whisk together the flour and baking soda in a separate mixing bowl, and then mix into the creamed butter mixture. Stir in the nuts, orange zest, and melted HERSHEY'S KISSES .
Drop the dough by large teaspoonfuls onto prepared baking sheet.
Bake cookies in preheated oven for 10 to 12 minutes.