Melt the chocolate chunks by placing the bowl over a saucepan with boiling water.

Whisk the eggs then gradually add the granulated sugar. Mix thoroughly.

Whisk-in the softened butter then continue mixing.

Add the melted chocolate then mix again.

Put-in the baking powder and salt then mix until fully distributed.

Gradually add the flour while mixing.

Pour-in the vanilla extract and coffee then mix until every ingredient is well incorporated.

Fold-in the chopped walnuts. Preheat oven to 350 degrees Fahrenheit.

Pour the chocolate mixture on a 9 x 13 greased baking pan then bake for 19 to 22 minutes or until it passes the toothpick test.

Remove from the oven and allow the temperature to cool down.

Slice and transfer to a serving plate.

Serve. Share and enjoy!