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Preheat the oven to 350 degrees. Spray an 8-inch square baking dish with cooking spray and set aside.
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Place the chocolate and butter in medium a microwave-safe bowl and heat in 30-second intervals, stirring after each interval, until chocolate is melted and mixture is smooth.
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(You can also melt them in the top of a double boiler, stirring constantly, if you don’t have a microwave.)
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Set mixture aside to cool for 5 minutes.
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Stir the eggs, sugar, and instant espresso powder into the chocolate mixture until very well combined. Mix in the vanilla, baking soda, and salt, again until well combined.
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Fold in the flour until just combined (just mix until you no longer see streaks of flour in the batter) then fold in the chocolate chips.
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Pour the batter into the prepared pan and smooth the top. Bake for 24 to 28 minutes, until the top of the brownies looks set.
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Place pan on a wire rack and cool completely before slicing and serving.