Heat oven to 400 degrees F.
Heat the oil in a cast-iron skillet over medium heat. Add the onion and saute 5-6 mins til onion is soft.
Add the ground beef and cook 4-5 mins until no longer pink.
Add the Ragu sauce and simmer, stirring occasionally around 5-6 mins.
In a small bowl, combine the cottage cheese, parsley, and some salt/pepper
Transfer 2/3 of the meat sauce to a bowl, leaving 1/3 the sauce in the skillet
Lay half the noodles over the sauce in the skillet, spoon half the cottoage cheese mixture over the noodles, sprinkle 1/2 cup of mozzarella, then repeat with sauce, noodles, cottage cheese,1/2 cup mozzarella and last 1/3 of the sauce.
Cover the pan tightly with foil and bake until the noodles are tender, 25 to 30 mins.
Remove the foil, sprinkle with the remaining 1cup mozzarella and bake or broil until the top gets brown and delicious.
Remove from the oven, and let it rest a few minutes.
Garnish with chopped parsley, and devour.