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Heat the oil in a large frying pan over a medium heat, add the onion and pepper and fry for 10 mins or until the onions have softened and are beginning to turn golden brown. Tip in the prawns and cook for 3 mins, then add the garlic and paprika and fry for another min. Stir through the coriander and beans, then season.
Heat a large non-stick frying pan or griddle pan over a high heat. Put one of the tortillas in the pan, then pile on the black bean and prawn mixture followed by the cheese. Press the other tortilla firmly on top, then use something heavy like a saucepan to weigh everything down. Leave to cook for 1-2 mins. Carefully flip over, weigh down again and cook for another 1-2 mins. Cut into four and serve with hot sauce and salad, if you like.