"It took me almost two years to clue into the fact that most of my formerly successful baking recipes were failing because I moved to a high altitude location. I've yet to try this high altitude recipe for chocolate chip cookies (from the back of the Toll House bag), but certainly plan on it the next time as the cookies I've baked with the regular Toll House recipe turn out flat as can be. The recipe specifies high altitude as 5,200 feet (or 1,585 meters). Feel free to substitute your favorite baking chip -- I like ..."