Heat oven to 400 degrees. Arrange tomatoes on foil lined pan brushed with olive oil.
Brush tops of tomatoes with olive oil, then sprinkle with salt and pepper. Roast for 30 minutes.
Add broth and potatoes, stirring well, the add onion soup mix, salt, & pepper to taste. Bring to a boil, then reduce heat to low, cover, & let simmer for at least an hour.
Serve and enjoy!
Store cooked soup in the refrigerator. Soup keeps nicely for at least a week.