Having been mostly vegetarian for some 15 years, I am well versed in the ways of substitution. Non-meat eaters often have to go to great lengths to satisfy their protein cravings. Many meat substitute products are frighteningly bad (vegetarian bacon? No thank you ...), but sometimes, these products actually excel: To this day DPaul and I still purchase veggie dogs (Yves brand are a particular favorite), and I am here to tell you that vanilla Tofutti Cuties truly are better than the real thing.
Giving up meat was one thing, but most recipes that eschew natural fats or sugars leave me utterly cold. It's not that I don't appreciate the desire to reduce calories and cholesterol (having, as I do, hereditary hypercholesteremia), but all too often these sacrifices are made at too high a price.
But once in a while, a recipe comes along that changes the way I think about low-whatever foods. It is, after all, possible to rethink a recipe totally, deconstruct it and rethink its elements, and return a newly engineered product that surpasses its predecessor. And thanks to America's Test Kitchen, chicken parmesan has been born again.