In a large bowl, combine the brown sugar, butter and sour cream. Beat on medium speed until creamy. Beat in the molasses and egg. Add all remaining ingredients except for the 1/4 cup sugar. Beat on low speed until well-mixed.
Refrigerate for at least 1 hour for easier handling. Heat the oven to 375 degrees. Lightly grease 2 cookie sheets. Place 1/4 cup sugar in small bowl.
Roll rounded teaspoons of dough into 1-inch balls; roll in sugar to coat. Place 2 inches apart on cookie sheets. Press with flat bottom of drinking glass or metal measuring cup to flatten slightly.
Bake 7 to 8 minutes or until lightly browned and set. Remove to cooling racks.