Heat olive-oil in a skillet and saute the onion, garlic and simmer until garlic is golden and onion at transparent. Add the tomatoes, tomato-sauce, basil, pepper & salt. Bring to a simmer and simmer uncovered for 25-30minutes until sauce is well thickened.
Create the cheese filling by mixing the ricotta-cheese, grated mozzarella-cheese, Parmesan-cheese, egg, dried parsley, sugar, pepper & salt.
When sauce is done , pour half the sauce at the base of the dish you intend to inhale the manicotti in.
Fill every al dente noodle with satisfying. I use a spoon to place some in every side of the noodle & then also do my very best to have it equally dispersed in the noodle.
Put each noodle from the skillet on top of the sauce that you poured .
When every noodle is put pour the sauce on the noodles.
Cover pan with foil and bake at 400degrees for 40minutes.
Eliminate foil sprinkle with Parmesan-cheese and return to oven for 5minutes.
Serve and Enjoy.