Step 1

Whisk together the melted butter, brown sugar and granulated sugar in a large bowl for two minutes.

Step 2

Whisk in the vanilla extract, egg and egg yolk until the mixture is light and creamy.

Step 3

Add the flour, baking soda, corn starch and salt and mix just until combined.

Step 4

Stir in the chocolate chips.

Step 5

Scoop out cookie dough, about 1/4 cup per cookie, and roll the dough balls in your hands until smooth. Place on a parchment lined baking sheet and freeze for 30 to 60 minutes.

Step 6

Preheat oven to 325 degrees.

Step 7

Place cookie dough about 3 inches apart on a parchment lined baking sheet or a baking sheet with a silicone baking mat.

Step 8

Bake for 12 to 15 minutes in the preheated oven. The cookies are done when the edges are golden and the center looks slightly under baked.

Step 9

Let the cookies cool on the baking sheet for at least 5 minutes and then transfer to a wire racks to finish cooling.

Step 10

Store in an airtight container for up to 5 days.