Preheat oven to 350.
Brown beef in large skillet, stirring frequently to break up chunks. Pour pasta sauce over beef. Fill empty pasta sauce jar with water, and add to beef mixture. Stir well. Spray 13 X 9 baking dish with cooking spray. Add 1 cup beef mixture to the bottom of prepared pan.
In a medium bowl, stir together ricotta, 1 cup mozzarella, 1/2 cup parmesan, eggs, parsley, salt, and pepper. Add 1/3 cheese mixture to pan. Use a spatula to spread it out a little. (does not have to be perfectly even). Top with 3 lasagna noodles.
Add 1 cup sauce mixture to noodles, followed by 1/3 cheese mixture. Top with 3 noodles. Add remaining sauce, remaining cheese mixture, and top with remaining mozzarella and parmesan. Your lasagna will be very watery at this stage. Pray underside of foil with cooking spray. Cover lasagna tightly with foil.
Bake, covered, at 350 for 1 hour. Uncover (lasagna will be soupy still), and bake an additional 30 minutes. (lasagna will still be soupy) Let stand 15 minutes at room temperature before cutting.