"Gooey chocolate cookie bars stuffed with milk, dark and white chocolate...."
INGREDIENTS
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115 grams (1/2 cup or 1 stick) unsalted butter, room temperature
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45 grams (1/4 cup) brown sugar
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100 grams (1/2 cup) caster sugar
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1 teaspoon vanilla extract
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1 large egg
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175 grams (1 and 1/4 cup) plain flour
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1/2 teaspoon baking soda
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40 grams (1/2 cup) cocoa powder
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1 tablespoon milk
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75 grams (1/2 cup) dark chocolate chunks
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75 grams (1/2 cup) white chocolate chunks
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75 grams (1/2 cup) milk chocolate chunks