Preheat oven to 400 degrees. Cut fillets into 3 - 4 oz portions. (Fist size). Melt butter. Crush Ritz Crackers into crumb size pieces. Mix together dry ingredients.
Dip halibut into melted butter then into cracker mixture. Place on baking sheet.
Pour remaining melted butter over halibut. Bake at 400 degrees for 12 - 15 minutes or until flaky when touched with a fork.