INGREDIENTS
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nonstick vegetable oil spray
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1/2cup(1 stick) unsalted butter
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4ouncessemisweet or bittersweet chocolate, coarsely chopped
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1tablespooninstant espresso powder
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2large eggs
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1cupsugar
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3/4cupall-purpose flour, spooned and leveled
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1/4teaspoonkosher salt
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1/2cupchopped walnuts
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1/2cupsemisweet chocolate chips