Preheat the oven to 350 degrees. Spray two 8 inch ramekins with cooking spray and set aside.
In a medium bowl combine the butter, sugar, and brown sugar. Mix well. Add in the vanilla and egg yolk and mix.
In a small bowl combine the salt, baking soda, and flour. Add the flour mixture to the butter mixture and mix until combined.
Fold in the chocolate chips and nuts.
Divide the batter between the two ramekins. Bake for 15-20 minutes or until the edges and top are golden brown.
Cool for 10 minutes then top with a scoop of ice cream and either chocolate or caramel sauce.