Heat the olive oil in a large pot over medium heat. Add the onion and garlic and cook until softened, about 5 minutes.
Add the red bell pepper and cook for an additional 2 minutes.
Stir in the crushed tomatoes, vegetable broth, oregano, basil, red pepper flakes, and salt and pepper. Bring the mixture to a boil, then reduce the heat and simmer for 10 minutes.
Using an immersion blender, blend the soup until it is smooth. Alternatively, you can blend the soup in a blender or food processor in batches.
Serve the soup hot.
Interesting Facts
Tomatoes are an excellent source of vitamin C, which helps your body fight off disease and infection.
Red bell peppers are extremely high in vitamin A, which is important for maintaining healthy eyesight.
This soup is perfect for an easy weeknight meal, and it can easily be made ahead of time and reheated.