Creamy Eggless Chocolate Frosting Recipe

Name: Creamy Eggless Chocolate Frosting Recipe
Cook time: 3 h
Total time: 3 h
Cuisine: American
Ingredients: 7 ounces plain or toasted sugar (1 cup; 195g); 2 ounces Dutch cocoa powder, such as Cacao Barry Extra Brute (about 2/3 cup, spooned; 55g); see note; 1/4 teaspoon (1g) Diamond Crystal kosher salt; for table salt, use about half as much by volume or the same weight; 32 ounces milk, any percentage will do (4 cups; 910g); 6 ounces heavy cream (3/4 cup; 170g); 12 ounces unsalted butter (about 3 sticks; 340g), softened to about 70°F (21°C)