This mac and cheese is super creamy, thanks to a secret ingredient! Can you guess what it is?
Carefully add macaroni to saucepan and reduce heat to medium-low. Cook, stirring occasionally with wooden spoon, until macaroni is soft, about 7 minutes.
While macaroni is cooking, tear American cheese slices into small pieces. When macaroni is soft, add American cheese pieces and mustard to saucepan and cook, stirring constantly, until cheese is completely melted, about 1 minute. Turn off heat.
Add cheddar and stir until evenly combined. Cover saucepan with lid and let sit for 5 minutes.
American cheese! That’s right—the same cheese you might find on top of your cheeseburger makes this macaroni and cheese extra creamy. Special salts in American cheese help it melt especially well. Those salts also keep the cheese sauce creamy and smooth. Don’t confuse real American cheese with individually-wrapped cheese “singles.” Those are made with extra ingredients that will make the sauce too thick, plus they don’t have a lot of flavor.