Preheat the oven to 400 degrees.
Combine the flour, baking soda, baking powder, and salt then set aside.
In a large bowl combine the butter, sugar, egg, sour cream and vanilla. Slowly fold in the flour and baking powder mixture.
Scoop the cookie dough into 2" balls and place about 2" apart on a large baking sheet. Use a flat bottom glass to gently press (flatten) each dough ball to about 1/4".
Bake 6-8 minutes.
Add a few drops of green gel food coloring to the white frosting and combine.
Scoop the green frosting into the small sandwich baggie and seal shut. Snip 1 corner of the baggie with the kitchen scissors.
Gently squeeze the green frosting out of the baggie to form a Christmas tree. Go back and forth making each row shorter until you reach the top.
Next, scoop some of the chocolate frosting into the other sandwich baggie and snip 1 corner.
Gently squeeze the chocolate frosting out of the bag to form the 'base' of the Christmas tree.
Sprinkle the multi-colored sprinkles on for lights and add a star on the top of the tree (optional).
*Makes approximately 36 cookies