Preheat oven to 350 degrees F. Line 2 cookie sheets with parchment paper.
Using a mixer, beat together the softened butter, brown sugar and 1 c sugar until creamy.
Beat in eggs one at a time and then vanilla.
In a separate bowl whisk together dry ingredients until combined.
Gradually add this dry mixture into your mixture until blended well and dough forms.
In a bowl combine last cup of sugar with cinnamon and stir. Form dough balls, using small cookie scoop, and roll into sugar and cinnamon mixture so they're coated.
Put on to cookie sheet and bake for 9-11 minutes. Do not overbake or they will not be soft and chewy. Take out once outside edges are cracking and firm with middle a bit wet. Allow to cool completely on tray before removing.