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oil, onion, finely chopped (optional), fresh garlic (no more than that or the garlic will overpower the other ingredients!), ricotta cheese, shredded mozzarella cheese, divided (can use a bit more), cream cheese, softened, grated parmesan cheese (can use more ), salt (to taste i use seasoned ), fresh ground black pepper (or to taste), frozen chopped spinach (cooked according to package directions, then hand-squeezed dry to remove excess moisture), manicotti, cooked and drained (you might use more shells so i would cook 10), marinara sauce (see my kittencal s marinara pasta sauce (vegetarian)), parmesan cheese (or to taste), mozzarella cheese, for topping (any amount desired)