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Preheat your oven according to the instructions on the brownie mix box.
In a mixing bowl, combine the melted or softened butter with the brownie mix.
Add in the two eggs and the additional egg yolk, mixing until well incorporated.
Stir in the four tablespoons of milk and the instant coffee powder, blending everything together smoothly.
If desired, fold in walnuts and a splash of extra vanilla extract for added flavor.
Prepare your eight by eight pan by greasing it or lining it with parchment paper.
Pour the brownie batter into the prepared pan, spreading it evenly.
If you like, sprinkle a pinch of sea salt on top and drizzle caramel over the batter.
Bake in the preheated oven for the time specified on the brownie mix box, or until a toothpick inserted in the center comes out clean.
Allow the brownies to cool before cutting them into squares and serving.