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Cook ground beef and onion in large skillet on medium-high heat until beef is no longer pink, stirring occasionally. Drain fat. Add oregano, cinnamon and garlic powder; mix well.
Stir in broth, tomatoes and tomato paste. Bring to boil. Stir in pasta. Reduce heat to medium; cover and cook 10 minutes or until pasta is nearly tender. Stir in spinach and 1/2 cup of the feta cheese. Cover. Cook 5 minutes longer or until pasta is tender.
Sprinkle with remaining 1/4 cup feta cheese. Cover. Let stand 5 minutes.