To prepare a vegetable lasagna casserole recipe, you will first need to prepare your ingredients. You will need: 1 1/2 cups ricotta cheese 1 cup mozzarella cheese 1/2 cup shredded parmesan cheese 2 tablespoons olive oil 1 tablespoon kosher salt 1/2 teaspoon ground black pepper 1 teaspoon thyme 1/4 teaspoon dried oregano 1/2 tsp. ground paprika 1 pound diced red bell pepper Instructions: Preheat the oven to 350 degrees F. Lightly grease an 8x8x2-inch baking dish with nonstick cooking spray. Place the cheese in the dish and toss to coat. Spread the vegetable mixture evenly over the top of the prepared dish. Bake for 20 to 25 minutes or until cheese is melted. Remove from oven and let stand for 5 minutes before cutting into squares and serving.