10min · 6 servings 2/3 cup all-purpose flour (for gluten-free, use a gluten-free baking mix) • ¼ teaspoon baking soda • 4 tablespoons butter, melted (use ¼ cup of coconut oil for dairy-free diets) • 1/3 cup plus two tablespoons sugar • 1 egg yolk, lightly beaten • 1 teaspoon vanilla extract • 1/3 cup chocolate chips