cream butter and sugar until fluffy

add eggs, vanilla, beat until smooth

combine flour, cocoa, 1 tsp cinnamon, cream of tarter, baking soda and salt. stir until dough is formed

in a small bowl, combine the remaining 3 tbs sugar and 1 3/4 tsp cinnamon

shape into balls, and roll in sugar mixture

place balls 2in apart on a lightly greased baking sheet

bake 6-8 minutes at 350