INGREDIENTS
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1/2 cup (1 stick) unsalted butter, cut into pieces, plus more for pan
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1 bag (12 ounces) semisweet chocolate chips
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1/2 cup granulated sugar
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1/2 cup packed light-brown sugar
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1/2 teaspoon salt
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2 large eggs
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3/4 cup all-purpose flour, (spooned and leveled)
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1 cup miniature marshmallows
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1/2 cup chopped nuts, such as cashews, pecans, or walnuts