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Cut zucchini lengthwise in half.
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Scoop out pulp, leaving 1/4 inch wall; Chop pulp and reserve.
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Place zucchini shells cut sides down in dish.
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Cover loosely and microwave on high (100%) until crisp-tender (about5-6 minutes.) Cover and microwave reserved pulp, onions, and butter in a 1 1/2 quart casserole or bowl on high until tender (6-7 minutes.) Stir in cheese, tomato, salt& pepper.
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Turn Zucchini shell cut sides up; spoon mixture into shells.
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Cover loosely and microwave on high until hot (2-3 minutes.).