Salem, I like them poached in butter and I know this sounds odd' but a little mayonnaise (just egg and oil anyway). (Miracle Whip does not make a good substitute in this recipe)
In a shallow casserole dish place the fillets. In another container, cup, etc. gently melt a couple tablespoons of butter (not heated) and add a couple tablespoons of mayonnaise, salt and pepper if you which too, stir. Pour your lovely sauce over your fillets and bake covered with aluminum.
350 to 375 for 10 to 15 mins, mind you ovens vary and thickness of fish, so after 8 mins, start checking for tender white flaky, heavenly, goodness, oh my, I'm now very hungry for poached fish, yum.....
It's quick, easy and not fried, which I like fried, it just doesn't like me.
p.s. do not add lemon until AFTER you are done cooking and the fish is on your plate, it just doesn't taste as fresh to me if you add the lemon while cooking.