Name: Chocolate Stuffed Vanilla Shortbread Cookies (Gluten-Free)
Prep time: 20 min
Cook time: 12 min
Total time: 47 min
Yield: about 30 sandwiched cookies
Ingredients: 1-1/2 cups (192g) cornstarch (tapioca starch or potato starch); 2 cups (240g) unbleached all-purpose flour or gluten-free flour blend; 1 tsp fine sea salt; 2 cups (450g) unsalted butter, softened; 10 tbsp (70g) confectioners’ sugar; 1/3 cup granulated sugar; 1 tbsp vanilla paste or pure extract; 1 to 2 tsp water, only if needed; 1/2 cup (1 stick, 112.5g, 4 oz) butter, at room temperature; 3 cups (338g) confectioners' sugar; 3/4 cup (89g) unsweetened cocoa powder; 2 tsp vanilla paste or pure vanilla extract; 1/3 cup whole milk or half and half, or as needed