I always have leftover spaghetti. Turning those leftovers into a pie is one easy way to switch them up a bit.
Preheat oven to 350° F.
In a large mixing bowl combine the spaghetti, eggs, Parmesan, butter, and Italian seasoning
Pour the spaghetti mixture into the 9" pie pan.
Pour the spaghetti sauce over the top of the spaghetti mixture.
Bake uncovered for 30 minutes.
Remove from oven, sprinkle shredded mozzarella over top of pie.
Bake for 5-10 more minutes, until cheese is bubbling.