Step 1

Preheat oven to 350 degrees F. Coat a 9- x 13-inch baking dish with cooking spray.

Step 2

Cook rigatoni according to package directions until al dente or firm; drain. Place in a large bowl and add ricotta cheese, garlic powder, 1-1/2 cups mozzarella cheese, and the mushrooms; mix well.

Step 3

Spread 1 cup spaghetti sauce evenly over bottom of baking dish. Spoon rigatoni mixture over sauce, then cover with remaining sauce. Sprinkle with Parmesan cheese.

Step 4

Cover and bake 45 minutes, or until heated through. Uncover and sprinkle with remaining mozzarella cheese and bake 10 more minutes.