Salted Twix Cookies

Name: Salted Twix Cookies
Prep time: 40 min
Cook time: 10 min
Total time: 50 min
Cuisine: American
Ingredients: 1 cup unsalted butter, softened; 1 ¼ cup sugar; 1 large egg, lightly beaten; 3 cups all purpose flour; 1 teaspoon baking powder; ½ teaspoon salt; 1 teaspoon vanilla extract; 40 soft caramel squares; 2½ cups melted milk chocolate; ½ cup melted dark chocolate; sea salt flakes