Name: Twix Bar Cookies {aka Millionaire's Shortbread)
Prep time: 15 min
Total time: 15 min
Yield: 1 (9 by 9-inch) pan, about 16 to 24 servings
Ingredients: 12 tablespoons (1½ sticks) unsalted butter, at room temperature; ¼ cup white sugar; 1 tsp pure vanilla extract, divided; 1½ cups all-purpose flour; ¼ + ⅛ teaspoons salt; 1 (14 oz) can sweetened condensed milk; 6 oz good-quality dark or semisweet chocolate (I use 65% cacao)