To prepare a three cheese vegetable lasagna cheese recipe, you will first need to prepare your ingredients. First, preheat your oven to 350 degrees F (180 degrees C). Next, slice your vegetables into bite-sized pieces. Then, toss the vegetables with the ricotta cheese and the Parmesan cheese. Spread the cheese mixture evenly on the bottom and sides of your greased 13x9x2-inch baking dish. Pour the sauce over the vegetable mixture and bake for 35 to 40 minutes. Remove the dish from the oven and let it cool for 10 minutes before serving.