Heat oven to 375°F. Lightly grease 12x8-inch (2-quart) baking dish. Prepare stuffing mix as directed on package using 1/4 cup margarine and water. Stir in broccoli. Spoon evenly into greased baking dish. Place fillets evenly over stuffing mixture.
In small bowl, combine 1 tablespoon margarine, lemon juice and onion powder. Brush over fish. Sprinkle with paprika. Cover with foil.
Bake at 375°F. for 30 minutes. Uncover; bake an additional 10 minutes or until fish flakes easily with fork.