Place a large pot over medium heat and add the ground beef. Cook until fully browned, breaking it apart with a spoon as it cooks. Drain off any excess fat.
Add the diced onion and minced garlic to the pot. Stir and cook for 3 to 4 minutes until the onion turns soft.
Pour in the beef broth and the can of diced tomatoes. Add the oregano, salt, and black pepper, then stir everything together.
Bring the liquid to a boil. Add the egg noodles and reduce the heat to a gentle simmer.
Cook for 8 to 10 minutes, stirring now and then, until the noodles are tender.