Cut slice off stem end of each tomato and discard.
Place tomatoes, cut side up, in circle on microproof plate.
Combine onion soup mix, melted butter, crumbs, parsley, and basil.
Divide among 4 tomatoes, spreading mixture on cut surface.
Cook, uncovered, on HI (max. power) 3 1/2 to 4 1/2 minutes, or until tomatoes are hot.