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Preheat the air fryer to 400°F and line the basket with parchment paper.
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To the lined basket, add the tomatoes (cut side up), onions, and garlic. Drizzle with olive oil, salt, pepper, and sugar.
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Air fry for 30 minutes, or until the vegetables have softened completely. After they have cooled a bit, peel the tomatoes and remove any stems.
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Add the vegetables and basil to a food processor. Pulse on high until smooth.
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Pour the blended veggies into a large pot over medium heat. Add the chicken broth, heavy cream, parmesan, and garlic powder. Heat through.
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Serve hot with extra parmesan cheese and basil. Salt and pepper, to taste.