“My biggest tip when making this soup is making sure everything is coarsely chopped the same size so that it all roasts at the same time on a single sheet tray. Less dishes = happy cook.”
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Preheat oven to 450°F.
Place tomatoes, onion, pepper, carrots, celery and garlic on a baking sheet. Drizzle olive oil over the top and season with thyme, chili flakes, salt and pepper. Using your hands or a kitchen spoon, toss veggies to coat them all evenly with the olive oil and seasonings. Roast in the oven until tomatoes are soft and veggies are caramelized and brown, about 15-20 minutes.