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Step 1: Melt together 1 cup of unsalted butter with 1 1/4 cups of semi-sweet or dark chocolate.
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Step 2: Combine 1/2 cup granulated sugar, 1 cup brown sugar, 3 eggs, 2 tsp vanilla extract, 1 tsp salt, and 1 tsp espresso powder.
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Step 3: Whip on medium-high speed until the mixture becomes very light and fluffy.
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Step 4: Pour in the chocolate mixture and mix to combine.
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Step 5: Add in 1 cup of all-purpose flour and 1/2 cup of dark cocoa powder.
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Step 6: Mix on low speed until the batter comes together and all the dry ingredients are incorporated.
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Step 7: Pour your brownie batter into a prepared 8x8 baking pan and spread to create an even layer.
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Step 8: Bake at 350 degrees for 35 to 40 minutes.
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Step 9: Allow the brownies to come to room temperature before removing from the pan and cutting.