In a large pot, boil the pasta in salted water. Drain the pasta, drizzle with olive oil (to prevent sticking) and set aside.
Either by hand or with a mixer, combine the eggs and ricotta cheese and mix until smooth.
Pour the pasta into two casserole dishes that have been sprayed with nonstick spray. Pour the ricotta egg mixture over each dish of pasta. Mix the ricotta mixture into the pasta a little, then pour a jar of sauce over each dish. Top with mozzarella cheese.
To bake right away, bake covered at 350° for 30-35 minutes. Uncover and bake for 10 minutes more or until the cheese is browned and bubbly.
To freeze, cover with foil and label dish with the date. You can freeze for up to eight weeks. To defrost, place on kitchen counter for about six hours then bake as directed above.
To cook straight from freezer, place frozen ziti in a cold oven and turn the oven to 350°. Bake for 1 1/2 hours, uncover and bake for ten minutes more to brown top.