Heat Olive Oil in 6-quart saucepot over medium heat and cook onion, stirring occasionally, 8 minutes or until tender. Add prosciutto and cook, stirring occasionally, 5 minutes or until almost browned. Stir in broth and Sauce. Reduce heat to low and simmer, stirring occasionally, 10 minutes. Add spinach and cook, stirring occasionally, 5 minutes. Serve, if desired, with grated Parmesan cheese and crusty Italian bread.