In a large saucepan bring 8 cups water to a boil. Add rice and stir. Reduce heat, cover and simmer for 20 minutes. Meanwhile, in a small saucepan over medium heat, melt butter and saute green onions. Stir in soup. Combine soup mixture with cooked rice and stir in mushrooms and almonds; mix well. Spoon half of the mixture into a 1 1/2 quart casserole dish. Sprinkle half of the cheese over the mixture, then repeat the layers.
Bake in preheated oven for 20 minutes, or until cheese is melted.