Preheat & Prep: Preheat oven to 400°F (200°C).
Roast the Soup Base: On a baking sheet, combine tomatoes, onion, 2 cloves garlic, and the 70g of torn bread. Drizzle with 2 tbsp olive oil, salt, and pepper. Roast for 30-40 minutes.
Bake Croutons: Toss 120g bread cubes with olive oil, smashed garlic, salt, and thyme. Bake at 350°F (175°C) for 20 minutes until crisp.
Blend: Transfer roasted tomato mixture (including the soggy bread) to a blender. Add bouillon, butter, and basil. Blend on high until completely smooth. Remember to taste and adjust seasoning before removing the soup from the blender.
Serve: Pour into bowls and top with garlic thyme croutons, and baby basil leaves.