In a large mixing bowl, beat together the butter, sugars, cream of tartar, and salt until fluffy. Add the eggs, one at a time, scraping between additions. Beat in the maple flavoring. In a separate bowl, whisk together the baking soda, and flour. Add the
Combine the sugars in a small bowl or in a large plastic bag. Drop the dough by the rounded tablespoonful into the sugar, gently shake the pan (or bag) to coat the balls, then roll them in your hands till they're smooth and round.
Place the cookies on parchment-lined or lightly greased baking sheets, about 1 1/2 inches apart. Bake them in a preheated 400°F oven for 10 to 12 minutes, or until they're a very light, golden brown. Remove them from the oven, and after 5 minutes transfer
Mix together the glaze ingredients to make a spreadable frosting. Smooth a thin layer over the cookies, or drizzle for a nice-looking effect. Let the glaze dry for several hours before packing the cookies in airtight containers. Store for 1 week, or freez