Orange Roughy is the mildest fish available (but any mild white fish will work) and good almost any way you cook it, but here is our family's favorite version:
Spread a thin layer of mayonnaise on frozen fillets, sprinkle with parmesan cheese and a squeeze of lemon or lime. Add pepper to taste and bake at 425F for about 15 t0 20 minutes.
We usually have it with a side of brown rice cooked in vegetable broth and peas and carrots, or a vegetable mixed through the rice as in tonight's dinner. Simple and delicious.