INGREDIENTS
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1/2 cup (115g) salted or unsalted butter*
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two 4-ounce (228g) semi-sweet chocolate bars, coarsely chopped*
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3/4 cup (150g) granulated sugar
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1/4 cup (50g) packed light or dark brown sugar
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3 large eggs
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1 teaspoon pure vanilla extract
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1/2 cup + 2 Tablespoons (80g) all-purpose flour
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2 Tablespoons (11g) unsweetened natural or dutch-process cocoa powder
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1/4 teaspoon salt
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1 cup (180g) semi-sweet chocolate chips
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optional: chocolate buttercream