Step 1

Preheat the oven to 325° F. Grease and line an 8-inch square baking pan with parchment paper.

Step 2

Mix the brewed coffee, melted butter, egg yolks, and vanilla extract until combined. Whisk in the instant espresso or coffee until dissolved.

Step 3

Using a rubber spatula, fold the brownie mix into the liquid ingredients. Fold in the chocolate chips. Reserve a few extra chips to sprinkle on top of the batter once it is in the pan.

Step 4

Transfer the batter to the prepared pan. Smooth it into an even layer.

Step 5

Bake the brownies for 40-45 minutes, or until the brownies are set. (These brownies are very fudgy, so a toothpick inserted into the center may not come out clean.)

Step 6

Allow the brownies to cool before slicing.