How about this?
Cod
2 tomatoes, sliced thinly
2 slices of white bread, crusts off and whizzed into breadcrumbs
2 slices of cheddar cheese, cut into small pieces
½ small onion, finely chopped (or whizzed in processor)
Salt and pepper
Preheat the oven to Gas 4/180ºC/180ºC for fan oven.
Put the fish into a shallow ovenproof dish
Lay the slices of tomato over the fish
Mix the remaining ingredients together and sprinkle over the tomatoes
Cook for 25 mins or until fish flakes easily
Twinkletoes