Preheat oven to 350°F. Lightly grease a 9x13 casserole dish.

Bring a large pot of lightly salted water to a boil. Place pasta in the pot, cook for 8 to 10 minutes, until a dente, and drain.

Mix in the cooked pasta and pasta sauce. Pour into prepared casserole dish.

In a bowl, mix the cottage cheese, olives, mushrooms and mozzarella cheese.

Spoon the cheese mixture over the pasta mixture.

Bake 25 minutes in the preheated oven, until bubbly and lightly browned.