HEAT oven to 400ºF.
REMOVE mushroom stems and finely chop. Set mushroom tops aside.
COOK mushroom stems and onions in butter in small skillet on medium heat 5 to 6 min. or until tender. Remove from heat. Stir in cracker crumbs, chicken, 1 Tbsp. cheese, wine and seasoning.
SPOON chicken mixture into mushroom caps; place on baking sheet. Sprinkle with remaining cheese.
BAKE 15 min. or until heated through.
