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In a large mixing bowl, cream together the butter, brown sugar, and granulated sugar together on medium speed.
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Add in the egg and vanilla extract. While still mixing on medium speed, add in the salt.
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Slowly add in the flour ½ cup at a time on low-to-medium speed. Fold in the baking soda, cornstarch, and butterscotch chips.
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You can either cover your mixing bowl with plastic wrap or spoon the cookie dough on top of the plastic wrap and wrap it like a log. Allow to chill in the refrigerator for at least 3 hours - overnight is best.
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Preheat oven to 350 degrees and line a cookie sheet with parchment paper or a silicone baking mat.
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Spoon the cookie dough onto the cookie sheet or slice and lay the cookies on top of the cookie sheet. Bake for 10-12 minutes.
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Allow the cookies to cool for 1-2 minutes and then transfer to a cooling rack.