Preheat oven to 400 degrees

In a large oven ready saucepan combine the mushrooms, tomatoes, onion, and 1 tblspn oil and cook down.

Add the spinach and rest of oil and cook till the spinach just starts to wilt. Do not cook till mushy.

Add the ricotta cheese and mix well as the cheese melts.

Remove the mixture from the pan.

Add the fish to the pan. Salt and pepper both sides. Then spread about 1/2 the spinach/cheese mixture on top of the fish. Place another layer of fish then spread the rest of the mixture on top.

Bake in a 400 degree preheated oven for about 30 minutes or until fish is flaky and done.