Nonstick vegetable oil cooking spray |
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1/3 cup plus 2 tablespoons water |
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2 tablespoons plus 2 teaspoons espresso powder |
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1 (19.8-ounce) box brownie mix (recommended: Duncan Hines) |
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3/4 cup semisweet chocolate chips |
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1 teaspoon vanilla extract |
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1 1/2 cups powdered sugar |
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1 tablespoon unsalted butter, room temperature |
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