1Heat the olive oil in a large pot over medium heat.
Add the chopped onion and sauté until translucent, about 5 minutes.
Add the minced garlic and cook for another minute until fragrant.
Stir in the canned tomatoes, vegetable broth, red pepper flakes, and dried basil.
Bring the mixture to a boil, then reduce the heat and let it simmer for 20 minutes.
Use an immersion blender to puree the soup until smooth, or carefully transfer it to a blender in batches.
Season with salt and pepper to taste.
Serve hot, garnished with fresh basil if desired.