mushroom risotto recipe

Ingredients: 1 1/2 cups Arborio rice 4 cups chicken or vegetable broth 1 cup dry white wine 1/4 cup olive oil 1 medium onion, finely chopped 3 cloves garlic, minced 1 pound mixed mushrooms (such as cremini, shiitake, and button), sliced 1/2 cup grated Parmesan cheese 2 tablespoons unsalted butter Salt and pepper, to taste