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instant espresso powder hot water cooking oil large eggs fudge brownie mix semi-sweet chocolate chips walnuts
Preheat the oven to 375 degrees and prepare mini-muffin pan with non-stick cooking spray or line with miini paper liners.
In a bowl, dissolve espresso in hot water. Let cool slightly, then whisk in oil and eggs until incorporated. Whisk in the brownie mix and finally, stir in chocolate chips and nuts, if using.