Melt the margarine in a frying pan. Add the onion and green pepper and fry until softened. Place 2 or 3 artichoke fronds in six well-greased individual ovenproof dishes and pile the pepper mixture on top. Combine the cheese, breadcrumbs and paprika and scatter a little over each serving. Bake in a preheated very hot oven (230°C/450°F, Gas Mark 8) for 10 minutes.