Preheat oven to 350 degrees F. Spray a 13 by 9-inch metal baking pan with nonstick cooking spray
To make the brownie batter
: In a large mixing bowl, combine the brownie mix, oil, milk, and eggs
. Beat with a handheld electric mixer
on medium speed until well combined and the batter is smooth. Sprinkle in the espresso powder, chili, powder, and cinnamon. Beat for another minute to evenly distribute.
Bake for 30 minutes, or until a toothpick inserted near the center comes out clean. Allow the brownies to cool in the pan completely.