To a large saucepan over medium-high heat, add olive oil. Once hot add onion, garlic and celery along with a pinch of salt and pepper. Sauté until onion has softened.
Add potatoes, oregano, thyme and chilli flakes. Mix everything together well and cook for a few minutes.
Pour in the broth and bring everything to the boil. Turn down to low heat and allow to simmer for about 10 minutes or until potatoes are tender and starting to soften.
Add beans and kale and allow to simmer for a further 5 minutes, or until the kale has wilted.
Taste, then season with salt and pepper as desired.
Serve up with some lovely uncut bread!