Step 1

Preheat oven to 350 degrees. In a microwave-safe bowl, heat butter for about 30 seconds in the microwave until melted. Stir in brown sugar and sugar and stir well until the sugars begin to dissolve and the mixture becomes smooth.

Step 2

Add egg yolk and vanilla and stir well.

Step 3

Fold in flour and baking soda and stir together. Fold in chocolate chips.

Step 4

Drop cookie dough onto a parchment paper lined baking sheet. This will make two to three cookies, depending on size. I suggest a light-colored baking sheet for all of my cookie recipes. Bake for 8-10 minutes. Don't overbake as the cookies will continue to bake on the warm cookie sheet once removed from the oven.