Quorn is great because it's both soy and wheat free -- made from mycoprotein, which is derived from mushrooms. Doesn't taste anything like mushrooms, though -- just like chicken or whatever. They do a breaded cutlet with gruyere cheese baked into the crust that melts when you bake it, and another one with goat cheese and cranberries in it. Holy crap.
I will say, though, the last few times I've tried their products, they've made me feel really strange afterwards. Didn't used to do that.