INGREDIENTS
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Makes an 8-by-8-inch pan, 9 generous squares
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1/2 cup butter, melted (1 stick)
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1 cup light brown sugar, packed
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1 large egg
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2 teaspoons vanilla extract
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1 cup all-purpose flour
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1/4 teaspoon salt, optional
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3/4 to 1 cup semi-sweet chocolate chips