INGREDIENTS
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8 tablespoons butter, melted
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1/2 cup brown sugar
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1/4 cup white sugar
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2 teaspoons vanilla
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1 egg
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1 1/2 cups flour
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1/3 cup cocoa powder
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1 teaspoon espresso powder, optional but recommended
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1 teaspoon baking soda
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1/2 teaspoon salt
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1 cup peanut butter chips