Reese, focussed in on your request for 'easy' veg lasagna.
One of the pesky things, for me, in making lasagna, is boiling those hard cardboard boxed noodles and having them break, laying them out etc. One thought is to buy fresh pasta/lasagna sheets. I think it also takes less time to boil, and I would imagine is a lot tastier - except for making your own noodles.
There are lots of recipes on the web called lazy lasagna, where you layer the ingredients with dry uncooked lasagna, pour on the sauce, cover and bake. I'm sure you could use any veg and cheese fillings of choice. I like spinach, ricotta, mozzarella, garlic, herbs. You could use a white sauce, rather tham a tomato sauce.
I have a very easy recipe using frozen ravioli, layered with sauce (sure you could add veggies of choice). If you're interested, let me know.