Several drops green and red Food coloring Beat butter or margarine in a large mixing bowl with an electric mixer on medium to high speed for 30 seconds. Add sugar and baking powder and beat till combined. Beat in egg and vanilla till combined. Beat in as much of the flour as you can with the mixer. Stir in any remaining flour with a wooden spoon. Divide dough into three equal portions. Add peppermint extract and green food coloring to one portion; mix till combined and set aside. Add red food coloring to one portion; mix till combined and set aside. Leave remaining dough plain. Cover dough and chill at least 1 hour or till easy to handle. Shape red dough into four 20 cm long rolls. Divide plain dough in half. On a lightly floured surface roll each half on plain dough into an 8x6-inch long rectangle. Place one red and one green lengthwise and next to each other on each rectangle. Stack a roll of the alternate color atop each roll. Bring up plain dough around stack and seal. Wrap rolls of dough in freezer paper. Store in freezer up to 6 months. For easier slicing, let rolls of dough thaw in the refrigerator several hours or overnight. To bake: Slice rolls into 1 cm thick slices. Place on ungreased cookie sheet. Bake in a 190ºC F oven about 8 minutes or till dough just begin to brown. Remove cookies; cool on wire racks. Makes about 60.