HEAT oven to 350°F.
MIX first 4 ingredients until blended.
SPREAD 1 cup spaghetti sauce onto bottom of 13x9-inch baking dish; cover with layers of 1/3 of the noodles and half each ricotta mixture and sausage. Top with layers of 1/2 cup mozzarella and 1-1/2 cups spaghetti sauce. Repeat all layers. Top with remaining noodles, sauce and mozzarella. Sprinkle with parsley. Cover tightly with foil.
BAKE 1 hour. Remove foil. Bake 10 min. Let stand 10 min. before cutting to serve.