1Heat oven to 375°F. In medium bowl, stir together cookie mix, butter, egg and flour. Add enough food color for desired shade of green. Roll dough by teaspoonfuls into 90 balls. Refrigerate at least 30 minutes.
2Roll 81 of the dough balls in green sugar. Cut each of the remaining 9 balls into thirds. For each cookie, gently press 3 sugared balls together on ungreased cookie sheet; add 1 cut dough piece for stem.
3Bake 8 to 10 minutes or until edges are lightly browned. Cool 2 minutes; remove from cookie sheet to cooling rack.