INGREDIENTS
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1 cup (2 sticks) unsalted butter, room temperature
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1 1/4 cups granulated sugar
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2/3 cup packed light-brown sugar
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1 large egg
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1/2 teaspoon pure vanilla extract
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1 1/2 cups all-purpose flour
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1 1/4 teaspoons coarse salt
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1/2 teaspoon baking powder
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1/4 teaspoon baking soda
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3 cups Cornflake Crunch
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2/3 cup mini chocolate chips
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1 1/4 cups mini marshmallows