In a skillet, cook sausage, onion and garlic until pork is no longer pink and onion is tender; drain. Add marinara sauce and oregano; simmer for 5 minutes. In a bowl, combine ricotta cheese, egg, 1/4 cup Parmesan and spinach.
In a greased 13-in. x 9-in. x 2-in. baking dish, spread 1 cup meat sauce. Arrange 3 noodles over sauce. Spread one-fourth of the ricotta cheese mixture over the noodles, top with 1 cup of meat sauce. Sprinkle with 1/2 cup mozzarella cheese. Repeat process 3 times. Top with remaining Parmesan cheese. Bake, uncovered, at 350°F for 40-45 minutes. Let stand for 10 minutes before cutting. Serve.
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