Cook box of rice according to packaged directions. In skillet, melt butter and sautee onion and celery over medium heat until softened, about 5 minutes. Once cooked, spoon rice into large bowl. To the rice, add cream of mushroom soup, chicken, vegetables, cream, cooked onion and celery, and salt and pepper. Spread into a casserole dish. Top with cheese and almonds. Cover with foil and warm thoroughly at 300 degrees for at least 30 minutes (and up to 60). Serve with a side salad.