heat the heavy cream, cream cheese and garlic salt in a medium cast-iron skillet over high heat. As the edges start to bubble, gently whisk the cream cheese until it is evenly incorporated into the heavy cream, about 1 minute. Allow to cook for 15 seconds so the mixture thickens. Add the Cheddar and American cheese and continue whisking. Pour the sauce over the pasta, stir and serve immediately!
Read more at: http://www.foodnetwork.com/recipes/quickest-mac-and-cheese.html?ic1=obinsite&oc=linkback