Sift dry ingredients (salt, sugar, low-sodium baking powder, and flour) together. Set aside.
Using either a beater or a stand mixer, beat the butter until light and fluffy. Beat in the eggs one at a time, about 1 to 2 minutes after each addition.
Slowly mix in the dry ingredients-don't beat too long or the cookies will be tough.
Divide dough into two parts, roll into logs, and wrap with parchment paper. This isn't a beauty contest, so no need to be too fussy about your logs, as you'll be rolling the cookies too.
Refrigerate two hours or freeze one hour. [Or overnight]
Mix the cinnamon, chai spice, and remaining sugar on a plate.
Cut the logs into one-inch pieces and form them into balls.
Roll the balls in the cinnamon mixture and place them on 2 parchment-covered baking sheets. You should end up with about 2 dozen cookies-big ones!
[Molly's note] Flatten the cookie dough balls slightly with the bottom of a measuring cup and sprinkle more sugar and spice mix on top.
Bake 8-10 minutes, removing them from the oven as soon as the first cracks appear.