01 - 
                Combine flour, baking powder and salt in medium bowl.
              
              
              
                02 - 
                Beat butter and sugar until fluffy. Add egg and vanilla.
              
              
              
                03 - 
                Add dry ingredients in two additions until just combined.
              
              
              
                04 - 
                Divide dough in thirds. Color one red, one green, leave one plain.
              
              
              
                05 - 
                Roll each color to 10-inch square, stack with red on bottom, white middle, green on top.
              
              
              
                06 - 
                Roll dough into log starting from one side. Chill 1 hour.
              
              
              
                07 - 
                Slice ¼-inch thick and bake at 350°F for 12-15 minutes.