Heat oven to 350°F. Generously grease 13x9-inch (3-quart) baking dish. Cut deep slits in rounded side of potatoes at 1/4-inch intervals. Place potatoes, slit side up, in greased baking dish.
Melt margarine in small saucepan. Stir in garlic powder. Spoon margarine mixture evenly over potatoes. Bake at 350°F. for 40 minutes.
Brush potatoes with margarine mixture from bottom of baking dish. Sprinkle evenly with cheese and bread crumbs. Bake an additional 10 to 20 minutes or until potatoes are fork-tender.