I would not touch quorn with a bargepole, pink manufactured flab
I would go the simplest route and add beans/whole lentils to a casserole, also grated carrot and if you do need a meat look-alike then you can buy tvp mince which you can soak a little while in oxo etc. Also curry is a good disguise for that
I am not veggie, nor vegan but most of my meals are meatless, yesterday was a hm veggie lasagne, I froze 8 portions. It was yummy and the main protein was beans plus it needed the extra amino acids from a whole grain, which was via the wholegrain spelt lasagne sheets
I have some tvp in my cupboard, good to add to a hm soup equivalent as a layer in a lasagne, it needs extra taste eg concentrated tomato