Preheat the oven to 350 F. In a large bowl, whisk together flour, sugar, cocoa powder, salt, and baking soda. Add in eggs, melted butter, and vanilla extract. Whisk until smooth.
In a shallow dish, combine granulated sugar and ground cinnamon. Using a cookie scoop, roll the brownie batter into balls, and roll them into the cinnamon sugar mixture.
Place the cookies onto a large ungreased baking sheet. Bake for 10-12 minutes.