OP - it did come across as a tad judgey and smug - - but I can sort of see what you were trying to say....
My DD (who is 6), is practically on the verge of chewing her arm off when she gets back from school. Her snacks vary - and giving her what you give yours, would never satisfy her - so, she will get cheese and crackers, sometimes biscuits (she had swimming today, and managed to get away with a crafty 3 Jaffa cakes! oops.....), or maybe a sandwich and then sometimes, crisps. She will also have fruit too.
I have to reign it in sometimes, but most times, she'll snack before her tea, eat all of her tea and a pudding (maybe ice-cream, or a chocolate mousse), and then demand more food in the run up to bed time! She has hollow legs, I'm sure.......
She has a very healthy lunchbox - no crisps, chocolate, cake (she wouldn't eat the healthy stuff if I included these!), and eats a very diverse range of food, including virtually all fruit and veg. I mostly cook from scratch - because I like to and have the time too (although also love a takeaway once a week, or maybe a shop bought pizza sometimes too).
She is a perfectly healthy size, and obviously follows me, as I was always ravenous (and skinny) as a child, and had a big appetite, as was my sister - she is a size 6/8, and I am usually a 10/12 (not quite that now but have a 4.5month old baby...).
It is all about balance and moderation - there are days when my DD eats utter rubbish - birthday parties etc, or days when I think it doesn't matter.
Reading your post back does make me cringe for you, due to it's tone......and I'd like to question what is wrong with Quorn???????? It's low in fat, high in protein and meat-free......probably technically much more healthy than a rich, fat-laden, homemade lasagne (although that sounds bloody lovely!).