1 box hake fillets
1 chopped onion
Stream hake fillets and when cooked flake the fish and put it into an ovenproof dish.
Fry the mushrooms with a little bit of garlic and mix in with the fish.
Mix in the cheese sauce with the fish and the mushrooms.
Top with mashed potatoes.
Put into a hot oven to heat through and brown the top of the mashed potato.