Preheat oven to 450 degrees F. Wash, core and cut the tomatoes into halves. Spread the tomatoes, garlic cloves and onions onto a baking tray. Coat tops with olive oil cooking spray and season with salt and pepper. Roast for 20 to 30 minutes, or until caramelized. Remove roasted tomatoes, garlic and onion from the oven and transfer to a large stock pot. Add chicken stock, bay leaves, and chopped sun-dried tomatoes. Bring to a boil, reduce heat and simmer for 15 to 20 minutes or until liquid has reduced by a third. Add basil leaves and Neufchatel cheese to the pot and stir until cheese is melted and incorporated. Use an immersion blender to puree the soup until smooth. Season to taste with salt and freshly ground black pepper.