Lofthouse-Style Frosted Sugar Cookies Recipe

Name: Lofthouse-Style Frosted Sugar Cookies Recipe
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Cuisine: American
Ingredients: 10 ounces powdered sugar (2 1/2 cups; 285g); 1/4 teaspoon Diamond Crystal kosher salt; for table salt, use the same weight or half as much by volume; 2 1/2 ounces heavy cream (shy 1/3 cup; 70g); 1 teaspoon (5ml) vanilla extract; 8 ounces unsalted butter (2 sticks; 225g), pliable but cool, about 60°F (16°C); 7 ounces sugar (1 cup; 200g); 2 teaspoons baking powder; 1 1/4 teaspoons (5g) Diamond Crystal kosher salt; for table salt, use the same weight or half as much by volume; 2 ounces egg white (1/4 cup; 55g), from about 2 large eggs; 1 ounce heavy cream (2 tablespoons; 30g); 2 teaspoons (10ml) vanilla extract; 11 ounces bleached cake flour (2 3/4 cups; 310g), such as Swans Down (see note); Assorted food coloring, nonpareils, and sprinkles, for decorating (optional)