In a Dutch oven, heat the olive oil over medium-high heat. Add the onion. Cook, stirring frequently until the onions start to brown, about 5 minutes. Stir in the celery, and garlic, and cook for 5 minutes.
Add the diced tomatoes. Simmer, stirring occasionally, for 8-10 minutes or until most of the liquid has evaporated. Pour in the broth. Stir in the potatoes, frozen vegetables, salt, pepper, and parsley. Bring to a boil.
Partially cover and simmer until the potatoes are tender, about 20 to 30 minutes. Taste and add more salt, if needed. ENJOY!