Heat oven to 350º. Cook macaroni as directed on package; drain. Cook sausage in skillet, stirring frequently, until no longer pink; drain.
Mix macaroni, sausage, pasta sauce, olives and mushrooms in 2 1/2-quart casserole.
Cover and bake about 30 minutes or until hot. Sprinkle with cheese. Let stand about 5 minutes or until cheese is melted.
*This is another BETTY CROCKER recipe. I made this for my kids and they loved it. I did leave out the mushrooms though because I am not a fan of mushrooms. I actually double the recipe then split it in two pans and froze one for a later date. I was able to pop the frozen one in the oven before I took the kids to piano lessons and when we got back it was all done baking. It baked for 1 1/2 hours.