This is seriously the easiest manicotti recipe EVER! It's really good, too. Maybe not the best I've ever had, but very delicious. (You'll remember this one Traci.)
1 pkg manicotti noodles
1 jar spaghetti sauce
1 pkg shredded cheddar (8oz)
1 pkg shredded mozzarella (8oz)
1 pkg shredded parmesan (6oz)
Combine cheeses and a tablespoon or so of parsley flakes. Mix in eggs until all the cheese sticks together. Stuff uncooked manicotti noodles and place in a 9x13 pan. Cover with spaghetti sauce. Fill sauce jar with water. Pour over noodles until they're completely covered (you may not use all the water). Cover with foil and bake at 350 for one hour.