Preheat oven to 350 degrees.
To a bowl sift together flour, cream of tartar, baking soda, baking powder and salt. Set aside.
To a separate bowl mix your 1 1/2 tbsp cinnamon and 6 tbsp sugar coating together. Set aside.
Cream together softened butter, brown sugar and sugar until fluffy, about 3 minutes.
Add maple syrup, vanilla and milk to the butter and sugar and continue blending until incorporated.
Slowly add the dry ingredients to the wet. Mix until the dough comes together.
Use an ice cream scoop that has the lever that cleans out the scoop to create the cookies.
Roll each cookie dough ball into the cinnamon and sugar until fully coated.
Bake on a parchment lined sheet pan for 10 minutes in batches.
Remove from the oven and bang the sheet pan on the counter 8 times.
Place cookies back in the oven for 2 more minutes.
Remove cookies from the oven and bang the sheet pan on the counter 8 more times. Then leave cookies to cool on the sheet pan for 2 hours.