Prepare using devil's food cake mix.
Chocolate Cinnamon Brownies
Prepare as directed, stirring in 1/2 tsp. vanilla and 1 tsp. ground cinnamon with the milk.
How to Test Brownies For Doneness
Unlike cakes, brownies are best when moist and fudgy inside. To check for doneness, insert a toothpick into the center. If it comes out with fudgy crumbs clinging to it, the brownies are done. For a visual test, make sure the edges of the brownies have pulled away from the sides of the pan.