This delicious spinach and mushroom casserole is packed with nutrients and flavor. It combines sautéed spinach and mushrooms with a creamy sauce made from Greek yogurt, garlic, and Parmesan cheese. The casserole is then baked until golden and bubbly, creating a satisfying and healthy dish. Serve it as a main course or as a side dish with grilled chicken or fish. This recipe is not only vegetarian but also gluten-free, making it a great option for those with dietary restrictions.