As others have said stay away from Quorn. It’s shite!
If you like chilli, make a 5 bean chilli. Any curry, whether indian or thai etc is superb when you use a load of veg. I usually put in pots, carrots, red onion, sugar snap peas and red pepper. A bit broccoli or cauliflower is tasty aswell. I honestly prefer veggie currys, as you get different flavour combos with every bite. Chickpea and lentil currys are the bomb. Home made garlic and coriander chapatis are easy and far better than shop bought crap.
Then there’s all the risottos, cous cous, salads and noodle dishes and more. A veggie diet is just as varied, probably more so, as any meat eaters diet.
I’m not vegetarian but i eat veggie at least 4 times a week. Corn fed chicken once a week, fish and a mince or beef dish the other.
And eating that way is cheap! I feed a family of four for £50 a week! That obviously doesn’t include bread and milk etc. Just the main brekkie, lunch and dinners.