Drain and flake salmon. Set aside. Saute onions and green peppers in 2 tablespoons margarine for 5 10 minutes, or until tender. Stir in flaked salmon, 1 cup cracker crumbs, milk, corn, eggs, cheese and pepper. Turn into an 8 x 8 x 2-inch baking dish. Melt remaining margarine; toss with remaining cracker crumbs. Sprinkle over casserole. Bake at 350 F for 30 minutes, or until knife inserted in center comes out clean. Nutrients Per Serving: Calories: 372 Fat-Total: 17.3 g Protein: 19.9 g Cholesterol: 117 mg Carbohydrates: 35.8 g Sodium: 824 mg Dietary Fiber: 2.26 g