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