Beat the 1 cup sugar and butter or margarine in a large mixing bowl with an electric mixer on medium to high speed for 30 seconds. Add yogurt, egg product, and vanilla. Beat till just combined. Combine flour, baking powder, nutmeg, baking soda, and salt in a small bowl. Gradually add flour mixture to yogurt mixture, beating till just combined. Cover and chill for 8 to 24 hours or until easy to handle.