Heat olive oil on a medium-sized pan over medium heat.
Add garlic and onion. Cook until onion has softened.
Add celery and carrots. Mix to combine.
Add potatoes and yellow peppers.
Pour broth and mix. Cover the pan with a lid. Turn heat to medium-high and bring to a boil.
Lower heat to medium and simmer until the vegetables are cooked.
Turn off the heat and blitz the vegetables until you get a smooth texture for your soup.
Season with salt and pepper. Mix.
Place the pan back on medium-high heat, cover with a lid, and bring to a boil.
Take the pan off the heat and transfer the soup into bowls.
Garnish with croutons and some fresh parsley, then serve.