Preheat oven to 400 degrees F.
Sift flour, cream of tartar, baking soda, 1/4 teaspoon of the salt, 1 tablespoon of the cinnamon and the cocoa powder into mixing bowl and whisk a few times. In another bowl, beat butter and 1 1/4 cups of the sugar until well blended. Add eggs, one at a time, beating between additions. Add the vanilla extract and beat a bit more until incoroorated. Add the flour mixture a little at a time and continue to beat, making sure to scrape down sides.
In a small bowl mix 2 teaspoons of cinnamon, 1/4 cup of sugar, cayenne pepper, salt and the chile powder. Whisk well and spread out in shallow dish.
Wtih clean hands, roll dough in balls (about a tablespoon at a time) and then roll each one in the cinnamon/sugar mixture. Place on parchment paper lined baking sheet about a couple inches apart. Bake for 8-10 minutes and let cool.
Makes about 24 cookies.