Saute chunks of mushrooms and onions in a margarine.
Add a light seasoning of either Lawry's seasoning spice or Montreal Steak Spice (don't overdo it with spices or it will overpower it).
In a large oven ready pot add 2 tablespoons of water or juice from a can of corn (for steam).
Cut skinned fish fillets of into palm sized chunks, add to pan, cover with mushrooms and onions.
Bake at 350 F till fish flakes easily (~20 minutes).