INGREDIENTS
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1 Tbsp butter, melted
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1 Tbsp granulated sugar
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1 Tbsp brown sugar
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⅛ tsp vanilla
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1 large egg yolk (do not use egg white)
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1/4 cup all-purpose flour (Spoon it into the measuring cup and then level it so it's not packed in tight.)
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⅛ tsp salt
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2 Tbsp chocolate chips