Heat the olive oil in a large pot over medium heat. Add the ground beef and cook until browned, breaking it up with a spoon as it cooks.
Add the chopped onion and minced garlic to the pot. Cook for 3 minutes until the onion softens.
Stir in the sliced carrots and celery. Cook for another 3 minutes to start softening the vegetables.
Pour in the beef broth and add the diced tomatoes along with their juices. Sprinkle in the dried thyme, salt, and pepper. Bring the mixture to a boil.
Add the egg noodles and reduce the heat to a simmer. Cook for 8 to 10 minutes, stirring occasionally, until the noodles are tender and the stew has thickened slightly.