We eat pretty well

2 Portobello mushrooms
1 can of salmon or crab meat
some chopped green onion
a bit of tartar sauce
crumbled taco chips (corn meal would likely work too)
Mix the filling, put it in the mushroom caps and top with some grated cheese. Bake at 350 for as long as it takes.

any mild flavoured fish fillets (ocean perch or walleye for example)
sour cream
a bit of lemon juice and a little mustard
lots of finely chopped fresh dill
Mix the sauce, place the fillets flat in a baking dish, spread the sauce thickly over the fillets and bake at 350 until the fish is almost done. Then broil to turn the outside of the sauce brown. If done properly the sauce will still be moist next to the fish but with a brown crust on the outside.