Combine margarine, lemon juice and lemon rind in a 1-cup microwave-safe glass measure; microwave, uncovered, at HIGH 30 to 40 seconds, or until margarine is melted.

Drain potatoes and pat dry. Arrange potatoes, cut side up, in 12x8x2-inch microwave-safe baking dish. Brush tops and sides of potatoes with margarine mixture. Cover with microwaveable plastic wrap and microwave at HIGH 12 to 14 minutes, or until tender; rearranging potatoes every 6 minutes and Brushing with remaining margarine mixture. Sprinkle potatoes with cheese mixture. Let stand, covered, 5 minutes.