Combine egg, mayo., zucchini, and onion. Add flour, Parmesan, oregano, garlic powder, salt, and pepper.
Melt butter and olive in a large skillet. Form zucchini mixture into patties by dropping about one cup of mixture into the frying pan and spreading the mixture in the shape of a patty. Fry over medium heat until well browned, approximately 2 minutes on each side.
For marinara sauce, saute onion and garlic in olive oil until onion is transparent. Add 1 large can of crushed tomatoes, 1 can of petite diced tomatoes, one can of tomato paste and one tomatoe paste can of water. Add basil, oregano, salt, pepper, and sweet n low.
Bring to boil and reduce heat to simmer for 30 minutes. Serve sauce over zucchini patties and, if desired, sprinkle with fresh grated parmesan.