2Heat remaining 1 tablespoon olive oil in a medium skillet over medium heat. Cook and stir garlic until fragrant and golden brown. Add eggplant and parsley; cook and stir until eggplant is tender and soft, about 10 minutes. Season with salt to taste.
3Spread eggplant mixture evenly across the bottom of the prepared casserole dish; sprinkle with a few tablespoons of Parmesan cheese. Spread zucchini in an even layer over top. Lightly salt and sprinkle with a little more cheese. Continue layering in this fashion, with tomatoes, mushrooms, onion, and bell pepper, covering each layer with a sprinkling of salt and cheese.