Fill the manicotti tubes or place a line of mixture on a piece of lasagna sheet and roll. To the bowl of onions, add the spinach, ricotta cheese, 1½ cups mozzarella cheese and ½ cup Parmesan cheese and mix well. Pour remaining sauce over manicotti. Beef Manicotti: replace the Italian sausage with lean ground beef. https://www.savingdessert.com/stuffed-manicotti-with-sausage-and-spinach This easy slow cooker stuffed shells recipe is just the opposite! Stuff uncooked manicotti with spinach mixture. Making a manicotti recipe with spinach can seem daunting. This easy slow cooker stuffed shells recipe is just the opposite! Spinach Manicotti: replace the ground beef or sausage with one 10 oz. package frozen, thawed spinach that has been well drained. Stuffing shells and making sure they are cooked to perfection without breaking, well, it can definitely be intimidating. Use two 10 oz. Arrange over sauce. Ground Turkey Manicotti: replace the ground beef and sausage with ground turkey. With remaining oil, brush a baking dish well and then add 1½ cups of the pasta sauce to the bottom of the baking dish. In a large bowl, combine ricotta, spinach, 1 cup mozzarella, 1/4 cup Parmesan, egg, parsley, onion powder, pepper and garlic powder. Combine spaghetti sauce and water; spread one cup sauce in an ungreased 13 x 9 x 2 inch baking dish. packages if omitting all of the meat.