Step 1

Preheat oven to 350 degrees and line a baking sheet with parchment paper.

Step 2

In a small bowl, cream softened butter and sugars togther. Then add salt and vanilla and stir until combined.

Step 3

Add egg yolk and stir again.

Step 4

Add baking soda and flour and stir until combined.

Step 5

Then stir in chocolate chips.

Step 6

Form cookie dough into two balls and place on baking sheet. Top with additional chocolate chips.

Step 7

The cookies will spread during baking, so make sure they are several inches apart.

Step 8

Bake for about 10 minutes, or until edges are golden brown.

Step 9

Remove baking sheet from oven and give the baking sheet a firm, but careful bang on the counter top. This will help deflate the cookie and give it a perfect wrinkly appearance.