Dice the onions, quarter the mushrooms and fry in a pan. When ready place into a large casserole dish. Slice, then fry the sausages and add to the casserole dish. Then add the beans and peas/sweetcorn, mixing everything well.
Boil the potatoes, then mash and spread on top of the mixture, topping with cheese.
Bake on gas mark 7 for approx 30 minutes until golden brown. Serve when ready.
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