Reserve 2 Tbsp. each
onions and tomatoes. Cook bacon in large skillet until crisp. Remove bacon from skillet, reserving 1 Tbsp. drippings in skillet. Drain bacon on paper towels. Add mushrooms to reserved drippings; cook and stir 2 min. or until tender. Remove from heat. Crumble bacon. Add to skillet with remaining onions and tomatoes; mix well.