Mediterranean Sausage and Spinach Pasta

I'm making this for a potluck tonight, and thought I should share.  It will be fall soon, and prime casserole time!

Mediterranean Sausage and Spinach Pasta

1 lb. Italian bulk sausage 

1 can garlic and onion spaghetti sauce 

1 can (2.25 oz) sliced black olives – drained 

1 package frozen spinach – thawed 

1 lb. penne rigate – cooked 

1 can mushrooms – drained 

3 cups shredded mozzarella 

Preheat oven to 350.  

Cook sausage in a large skillet; drain. Stir in sauce, olives, mushrooms, and spinach. Toss with pasta. 

Spray a 9x13 pan with cooking spray. Pour half of pasta into pan; top with half of cheese and repeat layers. 

Cover with tin foil and bake at 350 degrees for 25 minutes.