In a medium mixing bowl, cream the softened butter with brown and granulated sugars until light and fluffy.
Add the egg, maple syrup, and maple extract to the butter mixture and combine well.
Incorporate the flour, cream of tartar, ground cinnamon, baking soda, and salt into the wet ingredients and mix until fully combined.
Chill the dough in the refrigerator for at least one hour and up to two days.
Preheat the oven to 350°F (175°C) and line a cookie sheet with parchment paper.
In a small bowl, combine sugar and cinnamon for the coating.
Form 1-inch dough balls using a cookie scoop or hands, roll them in the cinnamon sugar mixture, and place them 2 inches apart on the prepared cookie sheet.
Bake cookies for 14 minutes until edges are set. Remove from oven and transfer to a cooling rack.