Preheat the oven to 350 F. Line a 12 cup muffin pan with paper liners. In a large bowl, mix together flour, sugar, cocoa powder, salt, and baking soda. Add in the eggs, melted butter, and vanilla extract until smooth.
Evenly divide the brownie batter between the prepared paper liners. In a large bowl, combine cake mix, eggs, and vegetable oil. In a shallow dish, combine granulated sugar and ground cinnamon.
Roll the cookie dough into balls, and roll each one into the cinnamon sugar mixture. Place the cookie dough over the brownie batter. Bake for 20-25 minutes.
