sliced or chopped onions
fish fillets
lemon juice
spices such as parsley, basil, thyme or whatever you like

Spray pan with nonstick spray. Place fairly thick layer of sliced or chopped onions on pan. Place fish fillets on onions. Sprinkle with lemon juice and spices. Bake in 375° oven for about 10 minutes, or until fish flakes easily.