Prepare pan by lining with parchment paper and oiling paper with coconut oil.
In a microwave oven, melt coconut oil in a microwave-safe bowl. You can also melt the oil in a saucepan on the stove over low heat. Add in chocolate chips and gently stir until chips are completely melted. Set aside to cool.
In a separate bowl, beat together eggs, coconut sugar and vanilla extract. You can beat by hand or by using a hand-held mixer. Beat until smooth, about 3 minutes by hand.
Add in melted chocolate mixture and mix well.
Add in cocoa powder, salt, cornstarch, and ground cinnamon. Mix well. Batter will be thick.
Pour and spread batter into prepared pan and bake for 25-30 minutes.
Remove from oven cool completely before cutting and serving.
Recipe by Zesty Olive - Simple, Tasty, and Healthy Recipes at http://zestyolive.com/flourless-chocolate-brownies/