Preheat oven to 350 degrees
Beat the butter then add sugars and mix well
Add egg, vanilla and green food coloring or chlorophyll and continue mixing
Stir in the sour cream
In another bowl, combine flour, baking powder and baking soda
Slowly add flour mixture to butter mixture and mix, adding more a little at a time and mixing
Knead dough until pliable and easy to break pieces off to work with
Break off 1-2 inch balls and roll between hands to make a long finger shape (make them skinnier than you'd think as they expand a bit)
Add knots where needed and indent where the "nail" will go with your pinky or an almond
Using a knife, slice three times just under where the nail will go and in the middle of the cookie.
Place on a silicone mat lined baking sheet then refrigerate for 30 minutes
Remove from fridge and bake at 350° for 9-11 minutes or until the bottom is golden brown.
Meanwhile, "paint" the almond nails using red food coloring or red koolaide mixed just slightly with water OR add them to a bowl and cover with red coloring then remove with a spoon to a paper towel lined plate to dry
Once removed from the oven, use frosting as an adhesive and add a small dot to the cookie and lay almond "nail" on top