Place the tomatoes, garlic, and onion pieces on your prepared sheet. Sprinkle with salt and pepper and drizzle with olive oil. Place in the oven for 1 hour or until the tomatoes roasted all over and aromatic.
Remove from the oven and place in a large pot or dutch oven with vegetable broth and basil. Cook over medium heat for 5 minutes.
Use an immersion blender to blend to your desired consistency.* If you like chunks of tomatoes remaining, feel free to leave it a little chunky, or blend all the way to a creamy consistency.
Simmer for 10 to 15 minutes or until the soup has reduced slightly. This will help the flavor deepen! If using, add the cream and stir to mix.
Serve hot with fresh croutons and parmesan cheese, or serve up with a toasty grilled cheese. Enjoy!
Notes
You can leave your tomatoes whole to roast them, or halve them and place them flat side down so they aren’t rolling around. Either will work!
If you don’t have an immersion blender, you can also transfer the soup to a high powered blender or food processor and blend! Simply place back in the pot after blending and follow according to directions.