Great question — answering as the UphillTech team:
Based on the nutritional information provided by Kraft and iHop, a good place to start would be more salt and more butter. A standard Kraft recipe is 360 Calories with 12 grams of fat and 710 mg of sodium, the iHop version is 350 Calories with 20 grams of fat and 920mg sodium. The iHop version also has less carbs and half the sugar which is a bit of a surprise, it probably means there's less actual pasta and those calories are made up with the butter. As I noted in my comment before I checked, this is generally the case with cheap restaurant food -- the reason it often tastes better than what you make at home is utterly absurd amounts of salt and fat and depending on the dish, cream and...
Full answer by eps: https://cooking.stackexchange.com/a/124133 (CC BY-SA 4.0).
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