The Food Labs Ultra Gooey Stovetop Mac and Cheese Recipe

Name: The Food Lab's Ultra-Gooey Stovetop Mac and Cheese Recipe
Ingredients: 1 pound elbow macaroni; Kosher salt; One 12-ounce can evaporated milk; 2 large eggs; 1 teaspoon Frank’s RedHot or other hot sauce; 1 teaspoon ground mustard; 1 pound extra-sharp cheddar, grated (see note above); 8 ounces American cheese, cut into 1/2-inch cubes (see note above); 1 tablespoon cornstarch; 8 tablespoons (1 stick) unsalted butter, cut into 4 chunks