Preheat oven to 350°F and grease a 9x13-inch baking pan.

In a large bowl, whisk together flour, sugar, and cocoa powder until well combined.

Add eggs and mix until incorporated, then slowly pour in hot coffee while stirring continuously until the batter is smooth.

Pour batter into prepared pan and bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.

Let cool for at least 15 minutes before serving.