Preheat the oven to 350?F (175?C).

In a mixing bowl, combine the cooked spaghetti, beaten eggs, Parmesan cheese, and olive oil. Mix well.

Press the spaghetti mixture into the bottom and up the sides of a greased 9-inch pie dish to form a crust.

In a separate bowl, mix together the ricotta cheese, mozzarella cheese, cooked ground beef, marinara sauce, Italian seasoning, salt, and black pepper.

Spread the filling evenly over the spaghetti crust.

Bake in the preheated oven for 25-30 minutes, or until the filling is bubbly and the crust is lightly golden.

Remove from the oven and let it cool for a few minutes before slicing.