Kaz I absolutely love moussaka, hope it was good but if not I can post
Last night I made a really yummy veggie lasagne, with enough for tonight, and it was still good
Given your veg haul - dice selection of onion/red onion, courgette, aubergine, pepper, mushrooms if available, plus tomatoes; toss in oil and roast.
Tomato sauce - tin of, with oregano, garlic, olive oil.
Also either make white sauce (proper, or cornflour/microwave version), or use creme fraiche & parmesan.
Layer splodge of tomato sauce, then lasagne sheets. Mix rest of tomato sauce with roasted veg.
Layer of veg/tomato sauce mix, then thin layer of sauce, then lasagne, etc.
Finish with tomato/veg layer, then top with sauce & parmesan. Bake.