Season the chicken breast then roast at 400°F for 20 minutes until cooked through; shred once cooled.
Place the halved Roma tomatoes and garlic cloves on a baking sheet, drizzle with olive oil, and season with the sea salt and black pepper.
Roast the vegetables at 400°F for 25 minutes until the tomato skins are blistered and slightly charred.
In a large pot over medium heat, sauté the diced yellow onion until soft and translucent.
Add the roasted tomatoes, garlic, and chicken bone broth to the pot and simmer for 10 minutes to meld the flavors.
Stir in the fresh basil and use an immersion blender to process the mixture until it reaches a velvety, smooth consistency.
Fold in the shredded chicken breast and heat through for 2 minutes.
Ladle the soup into bowls and garnish with the shredded parmesan cheese before serving.