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Boil the potatoes for 10 mins until tender. Drain, then mash. Heat oven to 220C/200C fan/gas 7. Roughly mash the beans with a fork. Mix with the mashed potato, sweetcorn, half the spring onions, all the cheese and half the egg. Season.
Toss the breadcrumbs with the oil and seasoning. Put the flour, remaining egg and crumbs onto plates. Take ¼ of the mix, pat into a burger, then dip in the flour, egg and crumbs. Place on a nonstick baking sheet. Repeat to make 4. Can be frozen at this stage. Bake for 15 mins, then grill for 2-3 mins until golden.
To make the salsa, mix the remaining spring onion with the tomatoes and ketchup. Season and serve on the side.