Heat a large pot over medium heat.
Add the chopped onion, carrots, and celery; sauté until softened.
Stir in the minced garlic and cook for another minute.
Add the ground turkey and cook until browned.
Season with salt, pepper, and oregano.
Pour in the diced tomatoes and chicken broth.
Bring to a boil, then reduce heat to a simmer.
Add the corn and let simmer for about 20 minutes.
Taste and adjust seasoning as needed.
Serve hot, garnished with fresh parsley.