In a large pot, heat the olive oil over medium heat. Add the diced onion and sauté until soft, about 5 minutes.
Stir in the minced garlic and cook for another minute until fragrant.
Add the ground beef or turkey to the pot, breaking it apart with a spoon. Cook until browned, about 5-7 minutes.
Season the meat with oregano, basil, red pepper flakes (if using), salt, and pepper. Stir to combine.
Pour in the crushed tomatoes and chicken or vegetable broth, bringing the mixture to a gentle simmer.
Add the broken lasagna noodles to the pot. Cook according to the noodle package instructions, usually about 10-12 minutes, until al dente.
While the noodles are cooking, in a separate bowl, mix together the ricotta cheese, half of the mozzarella cheese, and half of the Parmesan cheese until well combined.
Once the lasagna noodles are cooked, remove the pot from heat. Gently stir in the ricotta mixture until well blended into the soup.
Serve hot, topping each bowl with the remaining mozzarella and Parmesan cheese, and garnish with fresh basil or parsley.
Notes
Feel free to adjust the spices according to your taste.