Heat a large pan over low-medium heat, then add the oil and onion. Cook the onions, carrots, and celery until the onions begin to soften, about 3 to 4 minutes.
1 tablespoon cooking oil, 1 cup white onion, 2 carrots, ½ cup celery
Add the potatoes, vegetable broth, tomatoes, garlic, Italian seasonings, salt, and pepper. Stir to combine, and bring to a simmer. Cook at a simmer for 20 to 30 minutes or until the potatoes are tender.
1 pound potatoes, 6 cups vegetable broth, 15 ounces diced tomatoes, 1 garlic clove, 2 teaspoons Italian seasoning, 2 teaspoons salt, ½ teaspoon ground black pepper
Once the potatoes are cooked to the desired consistency, add the frozen vegetables, and cook for another 3 to 4 minutes, just long enough to heat the vegetables.
12 ounces mixed vegetables
Remove from heat, and serve with crackers, cornbread, or bread. Store leftovers in the refrigerator for up to 3 days.