Cook pasta according to package directions. Meanwhile, in a large skillet, cook sausage over medium heat until no longer pink; drain. Drain the noodles.
Spread 1/4 cup spaghetti sauce in a greased 2-qt. microwave-safe dish. Layer with half of the noodles, a third of the remaining sauce and half of the cottage cheese, sausage and grated Parmesan. Top with spinach
Repeat layers. Top with remaining sauce. Sprinkle with shredded Parmesan. Cover and microwave on high for 6-7 minutes or until heated through.