Cut tomatoes in half crosswise. Scoop out and discard pulp, leaving 1/4-inch-thick shells. Place, cut side up, in a lightly greased 11- x 7-inch baking dish. Sprinkle with salt and pepper.
Stir together cheese and next 5 ingredients; spoon over tomato.
Bake at 350° for 20 to 25 minutes.
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