Preheat oven to 325°F.
Butter a 9 inch square baking pan.
Combine the butter, sugar, cocoa powder, coffee, cinnamon, and vanilla in a medium saucepan over medium heat.
Stir until well combined.
Remove from the heat and let cool until warm.
Beat in the eggs, one at a time, until the batter is glossy and smooth.
Stir in the flour until combined.
Pour the batter into the prepared pan and bake until the brownies are set, 20 to 25 minutes.
Let cool in the pan.
Cut and serve.