Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Place the halved Roma tomatoes, chopped yellow onion, peeled garlic cloves, and the chicken breast onto the baking sheet.
Drizzle the olive oil over the vegetables and chicken, then season evenly with sea salt and black pepper.
Roast for 20 to 25 minutes until the chicken is cooked through and the tomatoes are blistered and caramelized.
Remove the chicken breast from the pan and use two forks to shred it into bite-sized pieces, then set aside.
Transfer the roasted tomatoes, onion, garlic, and any accumulated juices from the pan into a high-speed blender.
Add the chicken bone broth, cottage cheese, and fresh basil leaves to the blender.
Blend on high speed for 60 seconds until the soup is completely smooth, silky, and vibrant.
Pour the soup into a bowl and stir in the shredded chicken before serving warm.