Single-Serve S'mores Cookie

0 Preheat the oven to 350°F and line a baking sheet with parchment paper.
1 In a small mixing bowl combine the softened butter and the sugars and mix well. Add the egg yolk and vanilla extract and mix until smooth
2 Add the flour, salt, and baking soda. Mix until combined. Last, fold in the chocolate chips. 
3 Shape into 2 medium-large cookies 
4 Bake for 11 minutes or until the edges are just golden brown.