Salted Chocolate Chunk Shortbread Cookies

Name: Salted Chocolate Chunk Shortbread Cookies
Prep time: 15 min
Cook time: 14 min
Total time: 29 min
Cuisine: American
Ingredients: 1 cup plus 2 tablespoons (2¼ sticks) salted butter (cut up & softened to room temperature (see note)); ½ cup granulated sugar; ¼ cup light brown sugar (sub:dark brown sugar); 1 teaspoon vanilla extract; 2¼ cups all-purpose flour; 6 ounces dark chocolate (chopped into small chunks (see note)); 1 egg (lightly beaten (see note)); ½ cup turbinado sugar (for rolling (see note)); 1 teaspoon flaky salt (for sprinkling)