Salted Caramel Cookies

Name: Salted Caramel Cookies
Prep time: 15 min
Cook time: 10 min
Total time: 25 min
Cuisine: American
Ingredients: 3 cups all-purpose flour*; 1/2 teaspoon salt; 1/4 teaspoon baking soda; 1/4 teaspoon cream of tartar; 1/2 cup unsalted butter, softened; 1/3 cup vegetable oil; 2/3 cup [brand:name] Light Brown Sugar, packed; 1/2 cup [brand:name] Confectioners Powdered Sugar; 1 egg, room temperature; 1 tablespoon milk; 1 tablespoon vanilla; 2 bags (10.5 oz) Werther's Chewy Caramels, unwrapped; 2 tablespoons milk; 2 teaspoons salt; Flaky sea salt, for garnish