Preheat your oven to 350 degrees
Place 4 tablespoons of butter into a heat proof bowl and microwave until the butter is very soft and partially melted
Add 1/4 cup of granulated sugar and 1/4 cup of brown sugar to the softened butter and whisk until fully combined
Add 1 egg yolk and 1/2 teaspoon of vanilla extract and whisk to combine
Add 3/4 cup of all purpose flour, 1/4 teaspoon of baking soda and 1/4 teaspoon of salt and mix until just combined
Fold in 1/2 cup of chocolate chips or chunks
Divide the dough into 6 equal portions and place them onto a non-stick or parchment lined baking sheet
Bake the cookies for 7-9 or until they are lightly golden on the edges
Allow the cookies to cool for 10 minutes on the baking sheet before enjoying
(Optional) Sprinkle with sea salt while warm