INGREDIENTS
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◾16 tablespoons (2 sticks, 225g) butter, at room temperature
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◾1¼ cups (250g) granulated sugar
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◾⅔ cup (150g) light brown sugar, tightly packed
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◾1 egg
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◾½ teaspoon (2g) vanilla extract
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◾1½ cups (240g) flour [King Arthur bread flour]
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◾½ teaspoon (2g) baking powder
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◾¼ teaspoon (1.5g) baking soda
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◾1¼ teaspoons (5g) kosher salt
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◾¾ recipe (3 cups, 270g) Cornflake Crunch
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◾⅔ cup (125g) mini chocolate chips
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◾1¼ cups (65g) mini marshmallows