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Position a rack in the middle of the oven and preheat to 350 degrees F.
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Line 2 rimless baking sheets with parchment paper.
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In a bowl, sift together the flour, baking soda and salt and set aside.
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In a large bowl, combine the butter, brown sugar and granulated sugar.
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Beat with a wooden spoon until smooth.
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Add the egg and vanilla and beat until well blended.
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Slowly add the dry ingredients and stir just until incorporated.
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Stir in the chocolate chips.
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Drop the dough by heaping tablespoons onto the prepared baking sheets, spacing the cookies 2" apart.
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Bake the cookies, 1 sheet at a time, until the bottoms and edges are lightly browned and the tops feel firm when lightly touched, 10 to 13 minutes.
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Let the cookies cool on the baking sheets for 5 minutes, then transfer them to wire racks to cool completely.
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Store in an airtight container at room temperature for up to 3 days.