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Pre-heat oven to 350 degrees. Spray baking sheets with non-stick cooking spray or line baking sheets with a silpat or parchment paper.
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In a large bowl, cream together butter and sugar until fluffy. Add eggs, one at a time beating after each addition. Mix in vanilla extract/
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In a medium sized bowl, whisk together flour, cocoa, tarter, baking soda, and salt.
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Gradually beat in dry ingredients to the wet and mix until just combined. Fold in chocolate chips.
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Cover bowl with plastic wrap and store in fridge for 30 minutes. While the batter is chilling, prepare the topping and set aside.
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Using a cookie scoop, scoop dough out and roll into a ball in the palm of your and and then roll it around in the cinnamon & sugar mixture. Place rolled cookie on greased cookie sheets 2" apart. Bake for 8-10 minutes.
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Keep dough chilling in the fridge in between cookie batches.
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Allow cookies to cool 2 minutes before removing them to wire racks.