Preheat the Oven: Preheat your oven to 375°F (190°C) so it's ready to go when your casserole is assembled.
Prepare the Vegetables: In a large bowl, mix the cubed pumpkin, diced eggplant, cooked quinoa or rice, chopped onion, and minced garlic.
Season the Mixture: Add thyme, cinnamon, salt, and pepper to the vegetable mixture and toss to combine thoroughly.
Transfer to Baking Dish: Pour the mixture into a greased casserole dish, spreading it evenly.
Add Liquid: Carefully pour the vegetable broth over the mixture. If you’re using cheese, sprinkle it generously on top.
Drizzle with Olive Oil: Lightly drizzle olive oil over the top for added flavor and richness.
Cover and Bake: Cover the dish with foil and bake for about 30 minutes, until the vegetables are tender.
Uncover and Brown: Remove the foil and bake for an additional 15 minutes to allow the top to become golden and bubbly.
Garnish: Let cool for a few minutes and garnish with fresh parsley before serving.