Place a wide, lidded pan over a medium heat with 2 tbsp oil. Add the greens, salt and pepper and cook, with the lid on, stirring frequently, until the greens are lightly steamed and wilted, about 4-5 mins. Add the garlic and cook until fragrant, then add the butter beans and cook, stirring, until heated through. Add the remaining oil, then the cumin seeds and smoked paprika. Stir until evenly combined and serve over the cooked rice with a dollop of yogurt, if you like.