HEAT oven to 350ºF.
COOK and stir onions in hot oil in large skillet on medium-high heat 2 to 3 min. or until crisp-tender, stirring occasionally. Stir in crumbles and spaghetti sauce; cover. Simmer on low heat 10 min., stirring occasionally.
PLACE 3 noodles in 13x9-inch baking dish sprayed with cooking spray; top with layers of 1/3 of the spaghetti sauce mixture, half the cottage cheese and 1/3 of the mozzarella. Repeat layers. Top with remaining noodles, sauce and mozzarella; sprinkle with Parmesan.
BAKE 30 min. or until heated through (160ºF). Let stand 10 min. before serving.