Preheat oven to 395 degrees (if you aren't chilling the dough). In large mixing bowl, cream together butter, brown sugar, and sugar for 3-4 minutes. Scrape the sides of the bowl halfway through to ensure even mixing.

Add eggs and vanilla and mix for 1 minute longer, scraping the sides of the bowl.

Fold in all-purpose flour, cake flour, cornstarch, baking soda, and salt, just until incorporated. Don't overmix. Fold in milk chocolate chips.

If you are chilling the dough, place the cookie dough in plastic wrap and tightly wrap and place in the refrigerator to chill.

Roll the cookie dough into 4-ounce balls. Place on a parchment paper lined baking sheet. If you have a few extra milk chocolate chips, place on the top of the balls for a more gourmet appearance.

Bake for 9-11 minutes or until the edges are a light golden brown color. Remove from the oven and lightly sprinkle with sea salt flakes and let set for at least 10 minutes before removing from the baking sheet.