Preheat the oven to 350 degrees. Line a 9-by-13-inch baking dish with parchment paper, leaving an overhang on two sides. Lightly coat the parchment paper with butter or cooking spray. Set aside.

Melt the butter in a medium sized saucepan over medium-low heat. Remove from the heat and let the butter cool for 5 minutes.

In a medium sized bowl, whisk together the flour, cocoa powder, cinnamon, chili powder, salt, and baking powder.

Using a hand whisk, mix the sugar, eggs, and vanilla, into the butter in the sauce pan until thoroughly combined.

Add the flour mixture to the egg mixture and stir with a wooden spoon until smooth.

Transfer the brownie batter to the prepared baking dish.

Bake for 35 minutes, or until a toothpick inserted in the middle comes out clean. Cool completely. Remove from the pan using the parchment paper.