Preheat oven to 375ºF. In large mixer bowl combine sugar, butter, egg and vanilla. Beat at medium speed, scraping bowl often, until well mixed (1 - 2 minutes). Add flour, baking powder and salt. Continue beating, scraping bowl often, until well mixed (1-2 minutes). Divide dough into 3 equal portions. Leave 1/3 in mixer bowl. Add 5-6 drops green food coloring to dough in mixer bowl. Beat at medium speed until well mixed (about 1 minute). Place 1 portion plain dough in medium bowl. By hand, stir in chocolate. (You will now have green, chocolate and white dough.) To shape cookies, with hands roll dough into small ¼ -½ inch balls. Place balls on lightly greased cookie sheets in desired forms. Bake for 7-8 minutes or until set. Cool 1 minute. Carefully remove from cookie sheets; cool completely. Makes 3 to 5 dozen. TREES Place 10 green or plain balls to form a solid triangle. Use 1 chocolate ball for tree trunk. (Balls should touch slightly.) Decorate with candies. WREATHS Place 8 green, chocolate or plain balls to form a circle. (Balls should touch slightly.) Decorate with candies. CANDY CANES Place 7 chocolate or plain balls to form a candy cane. (Balls should touch slightly.) Decorate with candies or sprinkle with powdered sugar after baking. SNOWMEN Roll dough into 1-2 inch balls. Place balls to form snowman. Slightly flatten each ball with bottom of glass that has been buttered and dipped in sugar. TIP Any shape cookies can be formed using balls of dough. Try snowflakes, letters and ornaments.