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Preheat oven to 350 degrees. Line 2 cookie sheets with parchment paper or a silpat.
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Mix together butter and sugars until light and fluffy, add vanilla and combine.
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Add eggs, one at a time, mixing throughly in between.
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Stop your mixer and add flour, baking soda, salt and cornstarch. Mix on low until combined.
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Add chocolate chips and stir to combine.
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Scoop 1 tablespoon size scoops onto a cookie sheet 2 inches apart.
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Sprinkle with flaked sea salt if desired.
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Bake for 12-14 minutes.