Preheat oven to 400°F. Prepare baking sheet. Cream butter and sugars for 3-4 minutes.
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Next, add the eggs and vanilla to the creamed butter and sugar mixture.
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In a medium bowl combine the flour, cornstarch, salt and baking soda. Add to a stand mix and mix until just combined.
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Add the chocolate chips and walnuts and stir with a rubber spatula.
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Place cookie dough on the prepared baking sheet and bake the cookies for 8-10 minutes.
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