In a large bowl combine cooked noodles, butter, Parmesan cheese, and eggs. Spread into and up the sides of a 9 inch pie plates and set aside. (I just boiled my noodles, drained them, added them back to the pot and mixed in all the other stuff.)
In a pan, brown ground beef until done. Drain off any fat and add spaghetti sauce to the meat. Mix well and set aside.
Spread cottage cheese over the noodle crusts. And then spread meat mixture over the crust.
Spread mozzarella cheese on top.
Bake at 350 for 25 minutes or until set and cheese is melted.
Let sit for about 10 minutes before cutting and serving. This helps it set up and will make it easier to serve.