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Preheat oven to 400 degrees. In a large mixing bowl, cream together cubed butter, sugar, and brown sugar for 3-4 minutes until light and fluffy. Scrape the sides of the bowl halfway through to ensure even creaming.
Add in eggs and vanilla, if using. Mix for 1 minute longer to ensure it is smooth and creamy.
Fold in unsweetened cocoa powder, flour, cornstarch, baking soda, and salt. Stir together just until combined. Fold in white chocolate chips and milk chocolate chips.
Roll into 6-ounce balls. I suggest weighing the cookie dough with a food scale to ensure even baking. Place on a light colored baking sheet. It is important to use a lighter colored baking sheet or the bottoms may become too browned.
Bake for 9-11 minutes. After baking, let set-up for at least 10 minutes.
Nutrition information is automatically calculated, so should only be used as an approximation.
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