Preheat oven to 350F. Steam zucchini until crisp tender. Using a slotted spoon, transfer zucchini to a shallow 2 quart casserole. Stir pepper and chives into margarine and pour over zucchini. Cover with tomato slices; sprinkle with basil and cheese. Bake, uncovered, 30 min. Cal 54; Fat: 2 g.