This is *super* easy, and seems to be a crowd-pleaser! I've done it twice now, once with Tilapia, and once with Orange Roughy. Fantastic both times!
Fish (I get at least 1 fillet per person) - any type seems to work
Spices (I use Penzeys.....any of their blends will work)
4 Tbls butter
1 Cup (or so) Parmesean Cheese
Preheat your oven to 550*. (No, that's NOT a typo!) Take a handful of Saltine Crackers, put them in a large Ziplock baggie, and turn the kids loose with them. You want them nice and crumbly. (I guess you could use bread crumbs). Add the cheese and spices (our current favorite is Tuscan Sunset and a dash of garlic) and pepper, and shake-shake-shake the bag until it's well-mixed. Melt the butter.
Dip the fillet in the butter, drop it in the baggie, and shake 'er up. When you get all the fillets on the cookie sheet, sprinkle the left-over cracker mixture on them - I also add more cheese.
Pop in the oven for 10 minutes or so. You can put the broiler on for 5 minutes at the end (for a total of 15 minutes in the oven) if you want, but I've never found it necessary.
Serve, but don't get in the way of hungry folks...this just flys off of the table!