What is a good recipe for vegetarian lasagna?

I like to make it w/o a recipe. I just use prepared spaghetti sauce. I put a small amount in the casserole dish and then line with lasagna noodles. I mix garlic in ricotta cheese and put a layer of that next. Then I add whatever vegetables I want. Next, I add mozzarella cheese, Parmesan cheese, sauce and another layer of noodles. I cover that with spaghetti sauce, mozzarella and Parmesan cheese. I cover until almost done and finish uncovered. You can tell when it's done because it starts bubbling.