Preheat oven to 350°F. Line two large baking or cookie sheets with parchment paper.
Use an electric mixer to combine the butter, sugar, brown sugar, and maple syrup until fluffy. Add the vanilla extract and egg, and continue beating until just combined.
Pour in the flour, cinnamon, baking soda, cream of tartar, and salt, then mix until the dough is thick and stiff. Set the dough aside.
In a small bowl, make the cinnamon sugar. Stir together the 3 tablespoons of sugar and cinnamon.
Use a 1 ½ tablespoon cookie scoop to scoop out level balls of dough, gently use your hands to roll the dough into a ball, then roll it in the cinnamon sugar to coat it.
Place the dough balls on the baking sheets, about 2 inches apart.
Bake the cookies, one batch at a time, for 13-14 minutes or until they start to brown around the edges and look puffy in the center. Remove them from the oven and sprinkle some more cinnamon sugar on top while the cookies are still hot.
Let the cookies cool for 10 minutes on the baking sheet before transferring them to a wire rack to cool. Serve at room temperature.