Heat the olive oil in a large pot over medium heat. Add the diced onions and minced garlic, and sauté for about 3-4 minutes until softened.
Pour in the beef broth, marinara sauce, and diced tomatoes. Bring to a boil, and then add the broken lasagna noodles. Cover and simmer for 12-15 minutes until the noodles are tender.
Add more broth if needed and allow the spinach to wilt for about 2 minutes. Remove from heat, and garnish with chopped basil and a dollop of extra cottage cheese. Serve warm.