INGREDIENTS
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6 ounces bittersweet chocolate chips
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8 tablespoons unsalted butter cut up into 8 pieces
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2 large eggs, room temperature
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1 cup sugar
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1 teaspoon vanilla extract
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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1 1/4 cup cake flour (or 1 cup all-purpose as well)
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1/2 cup chopped walnuts (optional)