Heat the oven to 200ºC. Heat the olive oil over a medium heat. Add the onion and garlic and cook gently for 10 minutes. Tip in the tomatoes and rosemary along with a sprinkling of salt and pepper. Cook for another 10 minutes.
Tip the beans into an ovenproof dish followed by the beans. Stir together gently then top with the crumbled feta. Place in the oven and cook for 25-30 minutes.
For the Paprika Butter
Heat the butter in a small saucepan over a medium heat. Once it's melted whisk gently until little brown bits appear at the bottom of the pan. Remove from the heat straight away and add the smoked paprika. Stir and serve straight away.
For the Garlic Yoghurt
Stir the garlic and yoghurt together. Refrigerate until ready to serve.