Noted Maine seafood chef and author Barton Seaver discussed the need to popularize more varieties of fish during a Radio Boston segment today. When asked by the host for general guidelines on cooking fillets, he stressed low heat and recommended a toaster oven preheated at 275F. Cook until a little juice exudes when light pressure is applied by thumb.
I have often used one for baking one or two portions but used 350F. I will give lower heat a try.