Some random advice
On just about any prepackaged food that you have to prepare (frozen pizza, macaroni and cheese, etc.), you will see special "High-Altitude Directions" on the back of the box, for people 3,500 feet above sea level or higher.
Unless you are literally preparing food on top of Mt. Everest, you are probably better off just following the regular directions.
High altitude directions are a crock of shit. Just because you live in Western Kansas or something doesn't mean you have to cook your food differently.