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Preheat oven to 410 degrees. If your oven runs hot, I suggest reducing heat to 400 degrees. See below in notes for further detail.
In a large mixing bowl, cream together the butter, brown sugar, and sugar for 4 minutes, until light and fluffy. Scrape the sides of the bowl.
Add eggs and vanilla, if using. Mix for 1 minute longer.
Fold in flour *, cornstarch, baking soda, and salt. Mix just until combined to avoid overmixing. Fold in chocolate chips.
Separate the dough into large balls. For extra large cookies, roll them into 6-ounce balls (you will get 8 cookies from this recipe). For large cookies, roll into 5-ounce balls. For medium cookies, roll into 3 to 4-ounce balls. Make sure to spread apart of the baking sheet.
Line a light colored baking sheet with parchment paper. Place the cookie dough balls on baking sheet and bake for 9-12 minutes or until golden brown on the top. See below for tips.
Let them rest for at least 10-15 minutes to allow time to set up.
Store in an air-tight container.
Nutrition information is automatically calculated, so should only be used as an approximation.
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