Makes: 40 Cookies

Ingredients

• ½ cup unsalted butter, softened
• ¾ cup granulated sugar
• ¾ cup brown sugar
• 1 teaspoon cream of tartar
• ½ teaspoon baking soda
• ½ teaspoon salt
• ½ teaspoon cayenne pepper
• 2 eggs, room temperature
• 1 tablespoon vanilla extract
• ½ cup unsweetened cocoa
• 2¼ cups all purpose flour

Cinnamon Sugar

• ¼ cup granulated sugar
• 2 teaspoon ground cinnamon

Instructions

1. Prepare baking pans with parchment paper.
2. Preheat oven to 350F.
3. In a large mixing bowl, beat the butter and sugars together at a high speed until nice and fluffy.
4. Beat in cream of tartar, baking soda, salt, and cayenne pepper until well blended.
5. Beat in eggs, one at a time. Then beat in vanilla extract.
6. On low, slowly beat in unsweetened cocoa and flour just until combined.
7. Combine sugar and cinnamon in a small bowl.
8. Grab a small scoop of cookie dough. Use the palm of your hands to roll the dough into a round ball. It should be about 1 inch in diameter. 
9. Continue rolling all of the dough out, placing each ball onto a clean plate. 
10. Then roll each ball in the cinnamon-sugar mixture and place on the prepared baking sheet.
11. Using the back of a spoon gently flatten the middle of the cookie.
12. Bake cookies for 10 to 12 minutes, turning the cookie pan halfway through the cooking time.
13. Let cookies cool on cookie sheet for a few minutes before transferring to a wire rack to cool.
14. Store cookies in an airtight container.

Thanks to the original recipe found here.