I have two go to baked fish recipes. For one, I melt butter and combine with lemon juice, and black pepper. Pour over the fish filet, then cover the fish with slices of lemon and yellow onion.
The next one, I've only used for salmon. Generously sprinkle salt and black pepper on the individual serving size pieces of salmon.
Heat a heavy frying pan so sprinkled water dances in it. (I prefer a cast iron pan.) Pour in 2-3 tablespoons of olive oil. As soon as the oil just starts smoking, place the salmon pieces in the pan, but not touching each other. If your fish has skin, put the skin side down. Turn the heat to high. Cook for 2-3 minutes, just so the fish is golden brown around the edge where the fish meets the pan.
Transfer the frying pan to an oven preheated to 425°f. Let cook for 6-10 minutes, depending upon preferred doneness and size of pieces. We like it at about 8 minutes. This is my wife's favorite way for salmon, as she likes the crust.