Step 1

Preheat oven to 350°. Lightly grease a 9X13 pan.

Step 2

Boil pasta according to package instructions, about 8-10 minutes. Drain, rinse with cold water and set aside.

Step 3

In a skillet over medium heat, cook the sausage until evenly browned. Drain the grease. In a large bowl, combined the cooked pasta, spaghetti sauce and cooked sausage. Mix together in a large bowl. Pour half of the mixture into the 9X13.

Step 4

In a separate bowl, mix together the cottage cheese, olives, mushrooms and 12 ounces of the mozzarella cheese. Spoon this mixture over the pasta in the pan.

Step 5

Pour the remaining pasta over the cheese layer. Sprinkle with the remaining 4 oz of mozzarella. Top with pepperoni slices evenly spaced across the top of the casserole.

Step 6

Bake for about 25-30 minutes or until bubbly and heated all the way through. Serve immediately.