How to Make It
Heat oil in a large saucepan over high. Add beef, and cook, stirring occasionally, until browned, about 8 minutes. Add onion, celery, and garlic. Cook, stirring often, until vegetables are softened, about 8 minutes.
Stir in tomatoes and oregano, breaking up tomatoes with a wooden spoon. Stir in broth, and bring to a boil. Reduce heat to medium-low, and gently boil until vegetables are tender, about 8 minutes. Add gnocchi, and cook until just tender, about 3 minutes more. Remove from heat. Stir in spinach, salt, and pepper. Sprinkle each serving with grated Parmesan.