Jackpot Casserole

Directions:

Melt butter in large skillet over medium high heat. Add the celery and onion and cook until almost tender. Add mushrooms and cook and stir until all vegetables are soft. In a separate skillet, cook ground beef until done; drain. Combine celery mixture to beef, olives and rice in 4 qt. casserole. Add tomato sauce, salt and pepper; mix well. Cover and bake at 350 degrees for about 1 hour.