In a large skillet, sauté the peppers, onions, and mushrooms in butter until tender. Season to taste. Transfer to a serving bowl or casserole and keep warm. Heat the skillet on medium-high and add the frozen steaks. You may want to break them into smaller pieces for easier cooking. Cook as directed on the package; season with salt and pepper. Add the vegetable mixture and toss together with two forks to slightly break up the meat. Arrange each serving on a plate, top with cheese and microwave until the cheese is melted.
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