INGREDIENTS
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3/4cup(1 1/2 sticks) unsalted butter, plus more for the pan
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1 1/2cupsall-purpose flour, spooned and leveled
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1/2teaspoonbaking powder
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1teaspoonfine salt
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3/4cuppacked light brown sugar
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1large egg
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1/2teaspoonpure vanilla extract
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6ounceschocolate covered toffee bar, broken into small pieces (1 1/4 cups)
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