In a large pan, warm the olive oil over a medium heat, then add the onion and chicken thighs, cooking gently for about 15 minutes, until cooked through and golden.
Add the garlic, potatoes and courgette, and cook for 5 minutes, stirring often to make sure the garlic doesn’t burn.
Pour in the water, stir, bring to the boil and simmer for 10 minutes.