Step 1

Preheat the oven to 350, and line a small cookie sheet with parchment paper.

Step 2

In a small bowl, combine the melted butter and brown sugar. Mix the butter and brown sugar together with a small spatula.

Step 3

Next, add the egg yolk and vanilla extract and mix well.

Step 4

Then, sprinkle the flour and salt evenly over the bowl, and stir just until combined.

Step 5

Finally, sprinkle in the chocolate chips.

Step 6

Scoop the cookie dough onto the cookie sheet and try to mound it up a bit. Place a few more chocolate chips on top.

Step 7

Bake for 14-16 minutes. The cookie is done when the edges are turning golden brown, but the center may stay a bit gooey and soft. Let the cookie cool completely on the pan so that it sets.