Preheat oven to 350 degrees.
In the bowl of an electric mixer, combine shortening, butter, sugar, egg and maple extract.
Beat until thick and creamy. Combine the flour, cream of tartar and baking soda, and beat into the creamy mixture until smooth.
Using a teaspoon, spoon a teaspoonful onto a buttered baking sheet. Press with a wet glass bottom.
Bake for 8 to 10 minutes. Cool and transfer to a rack.