1 lb. cod fillets
1 tomato, sliced
1/4 onion, sliced thin
4 slices Swiss cheese
1/2 c. milk (must be at least 2%)

Layer cod fillets in greased Pyrex dish. Season with salt and pepper to taste. Layer tomato slices on top of cod fillets, then onion slices on top of tomato slices. Layer Swiss cheese on top of onions. Pour milk over layers and bake at 375 degrees for 20-30 minutes.