Place rice in a strainer or sieve and rinse with cold water for about 1 minute, scouring rice with fingers; drain.
Place rice in a saucepan with the broth; bring to a boil, reduce heat, cover, and cook for 40-45 minutes or until tender and most of liquid is absorbed.
If when tender, any liquid remains, drain it.
Cook the mushrooms, onion, celery, green pepper, and garlic in butter in a skillet until the onions are tender, about 5 minutes.
Mix together the rice, vegetables, and cheese, and spread in a greased 2-quart casserole.
Cover the pan and bake at 325F for 35-45 minutes or until the casserole is heated through nicely.
Garnish with toasted almonds before serving.