Creamy Mushroom Risotto Recipe: A Flavorful Delight

Risotto is an Italian dish with a creamy texture. It's usually cooked with various vegetables.

Suggestions:
- You can use different types of mushrooms in cooking this dish.
- You can also use your favorite vegetables.
- For better taste, you can also add some Parmesan cheese towards the end of cooking.

Ingredients:
* 1 1/2 to 2 cups Arborio rice (risotto rice)
* 1 onion, finely chopped
* 2 cloves garlic, minced
* 1 celery stalk, finely chopped
* 1 carrot, finely chopped
* 200g (about 7 oz) mushrooms, sliced (you can use any variety you like)
* 4 1/2 to 6 cups vegetable stock
* 2 tablespoons olive oil
* 1 tablespoon fresh thyme leaves
* Salt and pepper to taste
* Fresh or dried thyme
* Grated Parmesan cheese (optional, for serving)