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Preheat oven to 350 degrees and line a baking sheet with parchment paper or a silicon baking mat.
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Using either a handheld or an electric mixer, cream together the butter and sugar.
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Add in the egg and vanilla extract while mixing on low.
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Slowly add in the flour ½ cup at a time while mixing on low.
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Add in the salt and cornstarch.
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Fold in the chocolate chips with a plastic spatula or a spoon.
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Spoon the cookie dough onto the baking sheet and bake for 9-10 minutes.
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Let the cookies cool for 2 minutes, then transfer to a cooling rack.